I used the original Virtue One amp with a pair of Alpha B1s for about 6 months until I replaced them with Image B5s. The Alphas are great speakers for the price, but the Virtue One (or any of the other Virtue amps, for that matter) will really shine with even better speakers, they are that good. Use a good subwoofer, if it's in your budget. No, I don't work for PSB, I just like their stuff...
Cornelis