Batch, the question of how much power for the OW2/2000 depends on several things. Room size, how loud you like your music.
For what it is worth, I had a pair of 2/2000's for awhile in a room that measured roughly 15.5' X 16.5', with an adjoining kitchen/dining room area and two hallways off of this main room. So a decent amount of space to fill. If you do not play your music loudly, you might be okay with the 2000's, but in the end, and using Ohm's guide for speaker/room size, the 3000 was and is a btter choice for me. Where it mattered as to size of space, was mainly in the bass end of things, the 2000 could run out of steam in this space, the 3000 does not. I sometimes do like my music loud, not ear-splitting, but at decent volumes.
As to the power question itself, my system comprised of several solid-state amplifiers, 2 Anthems, one a PVA-2 rated at 105 wpc/8 ohm, a MCA-20 rated at 200 wpc/8 ohm, and my Audio Research D-130, rated at 130 wpc/8 ohm. All of these did fine for me on the 2/2000, but I did feel that with the MCA20 and also the ARC, did a bit better handling the load of the Ohm better at higher volumes.
My opinion is with the Ohm's, the more power-as long as it is good clean power and you are not overdriving your amp, the better. But, I have also read on this forum a few folks that have done well with fairly low-powered tube gear as well. It is all a matter of taste, try what you have and go from there.
I don't find the Ohm's to be overly sensitive to what you have, and many use fairly budget gear with great results, but one thing is, the Ohm's will definately improve with better gear if/when you move up the ladder. Enjoy your music, and your Ohm's! Tim