Trust me on this, Don't buy a Sony. I had/have (I beat it with a hammer when I'm frustrated) a Sony GSX-475, which was a 4x75 amp. It overheated without fail, to the point where the circut boards were charred. Don't get me wrong, when it worked, it sounded great, but most of the time I wound up listening to my exhaust instead.
Spend the $$$ on a HIGH QUALITY AMP, not one that "claims" to have xxxWatts. It doesn't matter what it looks like it matters what it does!!! Just a bit of friendly advice from a fellow PA CEG'r. If you're unsure, PM a few of the Vets from the audio forum, or do a search for the particular amp you're interested in.