Ask 100 people even among loudspeaker designers and you'll get plenty of different answers about drivers.
I have worked with just about everything out there and have found most drivers to be a series of tradeoffs. Having worked with a lot of different drivers does allow me to derive many personal listening impressions. I can agree some opinions here, but disagree with others.
I have also been a dealer for PHL, Focal, Raven, etc.

I have worked with Eton driver and Aurium Cantus ribbons offer a couple of kit using those.

I current stock planar magnetic drivers from BG Corp and they rank among my favorites for high frequency drivers.
The ScanSpeak Revelator driver will play lower than the W18 and have a slightly "warmer" sound, but it will not be nearly as detailed.
I got the same impressions from the Revelator woofers. They played low for a small woofer but really lacked resolution in the upper vocal region on up. I worked with them as soon as they were released.

I really didn't care much for them.
The Revelator driver doesn't lack for detail, it is easily the most detailed of the ScanSpeak line of drivers. It is definitely a woofer to be considered.
I can't say that I would agree with that at all.
The Scan-Speak woofer can work with a variety of tweeters and is very flexible in that regard. I believe it is simply the best 7" driver available for 2-way applications.
I don't know which one you are referring to but can't really see any of them making it that high up on my list. Some of the latest Usher woofers that I have worked with sounded better to me.
I do like some of their tweeters though.
The 1801 is an excellent speaker. The Seas Excel W18 midwoofer is extremely detailed and accurate - one of the very best there is.
Nothing against the 1801, but the Seas Excel woofers have never been too high on my list either. I find them a bit dry and lifeless, lacking in any natural qualities. They sound un-involving and lack any lushness or musicality. I have worked with most of them including the W18E and W18Ex models. There is also some nasty break up to contend with that is almost impossible to completely get rid of.
Here was an design I did several years ago for a customer.

To me, the Onix Rockets are warm but not detailed.
Which Rockets do you have? There are upgrades available for them that transform them quite a bit.
Dipping nicely into the 40Hz range, and capable of handling rock music well might be pretty tough order to fill for a small two way. You might have to consider a floor standing design.
My question would involve your room size and acoustics before making real recommendations. Your electronics will make a different too.