Woohoo - I just purchased from a fellow member here a GAS Son Of Ampzilla which will be swapped in and out with my Primare A34.2 just for kicks. GAS is one of those manufacturers I've been curious about for a long time, along with Moscode, Plinius, Crown, Belles, and Coda.
The GAS is rated at 160 watts into 4 ohms which is ample enough for my 3.5's - especially since my listening level is conservative.
The pre remains a BAT VK3i which I think is excellent as well.
Should be fun...