I agree with Tyson. The only reason not to step up to the Fetvalve is budget. The Fetvalve is an excellent performer, it has a very smooth and accurate top end (not colored like some tube amps) and has plenty of juice to power your speakers. If your budget only allows you to get the amp and, as a result, you are forced to use a low-end preamp, I'd suggest looking at an Omega and a T6 preamp. The preamp is very important and the synergy of an AVA amp/preamp is something that may warrant your consideration.
I listened to an Omegastar 440 amp and thought it sounded pretty darn good. Tyson is correct about the power supply upgrade. It really takes the Fetvalve and the Transcendance preamps to another level. Just get whatever your budget allows you to get. AVA has a really good return policy so there is minimal risk.
Lastly, AVA is one of the last of a (sadly) disappearing breed: independently owned, American electronic companies that actually designs and manufactures their products in the USA. It's pretty cool when you can call to discuss your products with the guy who owns the company, designs the products, coordinates the in-house production, answers the phone, makes the coffee, etc. Frank knows his products better than any manufacturer I have ever met. Unlike companies like Levinston, Red Rose, etc., the Van Alstine name actually means something. Maybe I'm crazy, but that means something to me.
Jack[/b]
