IMHO, you should audition any amps you're considering in your system at home before you buy. I recently auditioned a Halcro MC20 in place of a Proceed HPA2 (G68XXV, B&W Nautilus 802), and while there was some difference, I couldn't justify the cost. You may find that some amps just don't sound good to your ears, they might sound only incrementally better, or they might be a dramatic improvement. Try before you buy, as long as you have that option!

Meridian G68XXV, Meridian G08, Panasonic Blu-Ray, Proceed HPA2/AMP3, Nautilus 802/HTM1/805, Velodyne DD-12, JVC DLA-RS1, Stewart GreyHawk RS