02-16-09: Tvad
Long list of suggestions, yet no one knows what the OPs power requirements are based on his speakers' specifications or room size.
That is true Tvad, though we do get a couple of clues from the original post. First, 100 watt tube amp is not enough power. Second, he has heard and enjoys the Pass XA series, but he's afraid he can't get enough power in his price range. So my guess would be that he's looking for 200+ wpc. In which case he should ignore my previous reco of the darTZeel.
I'll stand by my Clayton M-300 reco though. I can't imagine 300 wpc of pure Class A power would not drive his speakers.
John