Another vote for MiniDSP, I was very sceptical until I heard a friend's AudioNote Kit AN-Es using one as an active crossover and ordered one as soon as I got home. I have Rega Xels, which are effectively your speakers forebearer! I should mention that they also do a streaming pre-amp with all the DSP built in which I subsequently decided to order and has just landed at UK Customs. They do an integrated too, but sadly that only offers digital inputs.
Final thing I would mention, my room is an absolute pig and before the MiniDSP after extensive experimentation I ended up with a very unusual speaker placement, about six inches from the side walls and four feet from the back walls with quite a severe toe in, roughly 15 feet apart and each roughly 8 feet from the central listening position. This gives an amazing soundstage, and a bass roll off that stopped them over exciting that room. With the MiniDSP in place after some experimentation they have ended up back in that position with the MiniDSP also feeding a Rel Strata Sub, so now I have the best of all worlds, the amazing soundstage, the room no longer booming along at various frequencies around 50Hz, the sub perfectly integrated and not noticeably a separate unit except when BluRay movie effects get silly and everything near it starts vibrating! So have a good play with your positioning, even if it flies against convention, by definition convention doesn't work in unconventional spaces!
If practicalities really do dictate a move to smaller speakers the ones that spring to mind reading your description of your requirements are some of the Elac bookshelf speakers with Jet tweeter and aluminium midbass, I have heard both the wood bodied and and the aluminium bodied versions in some fairly small and awkward spaces and the spacial, bass, versatility with music and volume was all there for me. If you like the idea of actives I am told some of ADAM's monitors use a similar tweeter technology and are very highly regarded. I don't have any personal experience of them, but they might be worth looking at if you don't mind a less domestic look!