Genesis Vs do a wonderful job with piano, are well under your budget, and I suspect would work with either amp. For a different presentation, the Audio Physic Avanti IIIs are nice as well. You can also occasionally find Verity Parsifal Encore's in your price range, which I would also highly recommend if you are interested in an accurate rendition of the piano. However, for the latter two speakers, I am not sure how they would work with your 35 w/ch tube amp -it really depends on the amp. For example, the Vac Renaissance 35's should work very well with either (depending on room volume and other system factors), but other low powered tube amps may not be the best choice.