A lot of people here tout the virtues of this or that amp, and rightfully so (there are a lot of great amps out there). However, I keep plugging along with my Aragon 8008BB (as well as my 3 & 5 Channel 8008's for my HT), and I have yet to feel the need to upgrade. I keep working on the other areas of my system and the 8008's have yet to become the weak link.
I have found though, that the Aragons do benefit from good power conditioning, and for me that has been the Richard Gray product line. They've been expensive, but very effective, and I live in a very noisy area (electrically speaking). Another effective power consideration would be dedicated a circuit(s) with an isolated grounding system.