At this point, I'm looking for just a preamp, as I plan on keeping ?22 as my headphone amp - it works rather well with RS-1 and K1000.
If ?22 works well as a preamp, I may see about getting a remote-controlled volume control installed. Of course, with my lack of experience with preamps (and speaker setup in general), I don't really have a god point of reference for preamp performance.