The reality is that ProAc speakers in general can easily accomodate a variety of electronics, which probably speaks for their ability to present a fairly consistent load. The CJ/AR/Linn sounds are about as different as you can get, but the ProAcs tend to sound good with all of them. You really do need to figure out what kind of sound you want (for myself, I lean towards a big, warm sound which is why I recommended CJ) and then give the speakers a whirl with electronics that will provide it. You're not so much assembling parts are you are building a system, so keep the end result in mind when experimenting with the components.
Good luck,
Ken