Not exactly sure what you are looking for here. I've owned AKG K1000s, and feel they are fantastic headphones in the right system. I ran mine with Sig 30 or 30.2, cause I don't remember what was current when I sold my AKGs.
No matter what you do with K1000s, IMO they will never be able to match really good speakers in a good listening room. The advantage is the Ks don't care about the room or room set up, so that is a consideration.
In my case I moved to single drivers from Omega. And now I'm on Omega's latest with Super 6 monitors and Deep Hemp. I listen near field, so that's a bit akin to headphones (maybe 7-8 feet apart and a lesser distance from the plane of spkr fronts to ears). What I hear is a major step beyond the Ks.
Another potential area for upgrade is your DAC. I’ve only AB’ed RWA with one other premium DAC (Wavelength Cosecant), but feel Vinnie’s NOS DAC is superb for my musical tastes. Now you have the option to own his DAC that supports two modes: One for NOS and one for hi-res. I have not heard the hi-res version, but one RWA owner reported on AC the he preferred it for complex classical (if my memory serves accurately?). I listen to smaller works, like vocals and trios, where the NOS sounds so natural I love it.
Both RWA and Omega have good return policies and both are very good about giving product guidance if you send an e-mail or pick up the phone. Good luck whatever you decide.
I am not looking for a preamp or monoblocks anymore.
If I would like to use my Signature 30.2 as passive preamp for monoblocks with ACI Emerald XL speakers then they would be overkilled.
It would be better to upgrade my speakers and/or I would like to re-acquire an AKG K 1000 so my Signature 30.2 can still be of good use.
