I use a pair of Channel Islands VMB-1 monoblocks between my 901 and VR-1's. everything sounds great and I love the setup. but , it's only 40 watts, which may not be enough for you.
I'd recommend a Channel Islands D100 (the 100w model).
(of course, my recommendation assumes that the D100 is similar sounding to the VMB-1 and that the VR-2's are similar sounding to the VR-1's. both of which are alright assumptions, IMO). now, for the price, I think they come up in your range used, if you keep an eye on audiogon.