I have had the chance to listen to LS50’s at my local audio dealer driven by Marantz electronics. I also have a Marantz AVR at home with a similar sonic signature. These electronics are less expensive and likely not as nice as your Yamaha, but I provide the information for context.
I also own three pair of Omega speakers: a pair of original wide-baffle Super 3’s with the latest drivers (similar in proportions to the CAM), a pair of Super 3 HO Monitors (dual-driver), and a pair of SAM’s. I can offer my opinions on their relative qualities:
Super 3 (single driver). I will assume similar qualities to the current Super 3 model.
This is the best bargain in the Omega line. Not only is it the least expensive, but it gives you 70% of the full Omega sound for $695. This is a great speaker for near field listening, and my wide-baffle models have a front port that allows for shelf placement. The wide baffle helps flesh out the lower midrange, especially when mounted close to the front wall. When compared to the KEF, it sounds a bit more midrange-prominent, faster and more detailed (especially inner detail) but appreciably thinner in the mid to upper bass.
This is the speaker I would start with if I wasn't sure which direction I was going. I would also ask Louis if he could make it a wide-baffle, front-ported configuration for maximum flexibility. At least two of us here use this configuration and love it.
Super 3 HO (dual driver). Current model, just broken in.
This is perhaps the most versatile speaker in the Omega lineup. It is a bit more efficient than the single driver model but more importantly has a much fuller (almost rounder) midbass. This speaker works well with very low power as well as higher solid state power. I've used it both with a 4wpc SET and my solid state RWA Signature 16. It sounds really meaty with the solid state amp and in my room actually gave me too much midbass. You do lose a bit of the purity of the single driver model, but not enough to really miss it for more than a moment. This is the closest Omega equivalent to the KEF and is in my opinion a much superior speaker.
This is speaker I would recommend to you right now. It will upgrade the experience you have with the LS50 while offering greater dynamics. The HF presentation will be different, but better in my opinion. This speaker also integrates better with most subwoofers. I've found that with the single driver models dual subwoofers crossed over much higher than usual (150-200hz) integrate better. The HO Monitor has enough extra midbass energy blend better with subs crossed over <100hz.
Super Alnico Monitor (single driver). Current model, well broken in.
I would expect the performance of this speaker to be similar to the CAM with the exception of the bass. I use to own a pair of Super 3U’s (Super 3 monitor with the cabinet volume of a Super 3 XRS) and found that when compared to the Super 3 Monitor the bass was deeper but maybe a bit less “snappy” than the smaller speaker. My opinion is that the larger volume models begin to act like an a periodic enclosure (lossy sealed enclosure) to some degree. This sort of bass works well with room reinforcement in my experience. The smaller enclosures seem to give a better impression of bass energy but seem to drop off faster.
The Alnico monitors sound more natural, more dynamic with much greater inner detail (ironically, they seem to be a little more forgiving than the RS5 drivers), but do have more of the single-driver sound than the RS5 models. It is difficult to describe, but compared to the RS5 models the Alnico speakers do not seem to have to work as hard. Compared to the KEF, this is no contest. Again, you have the slightly thinner midbass, but I would guess that the CAM bass alignment and near-wall placement would put the midbass of the CAM at or above the KEF.
The CAM is the speaker I would buy for myself if I were starting from scratch today. It fits on a 24” stand, can be used in any location, and will scale with system upgrades. However, if you are looking for the best all-around model that will work in most conventional applications (stands in the middle of the room, active subwoofers, solid state electronics) I would probably choose the Super 3 HO Monitor.
If I wanted to get the Omega sound and money were tight: Super 3 Monitor
If I wanted the best all-around speaker for most systems: Super 3 HO Monitor
If I wanted the “best” Omega that will scale with system upgrades: Compact Alnico Monitor
These recommendations are based on my own personal taste and values. One value is for speakers to be no larger than necessary for the job they need to do. I feel that the extra bass from the larger enclosures can be better obtain from active bass reinforcement. I'm too old to be shlepping 100 pound speakers around the house. I also find that my mood greatly influences what equipment I like, and there are times I need to swap a DAC, amp or pair of speakers because I am in the mood for a different sound. Monitor speakers that all use a 24” stand make this easy.
The original poster has a vinyl front end (his name is ThoresSme, so I assume it is a nice front end), a fairly expensive integrated amp, and a pair of high-performance monitor speakers. Rather than reinvent his system (telling him to buy new speakers and switch to tube amps), I would recommend he go with the Super 3HO Monitors. His amp will likely be operating in Class A most of the time and should provide really great bass with these speakers. The amp has preamp outs, so if he wanted to experiment with low-power tubes down the road it would be an easy speaker cable swap. They also offer a great way to add dual subwoofers if he wanted as well.
For further context, the system I am listening to most of the time is a pair of Super 3 HO’s driven by a SET fed by a Chord Mojo streaming Tidal. I know that I can swap in some different components to significantly improve the sound, but I find the current lazy setup so satisfying I find it difficult to motivate myself to make any changes.