I don't know what he's using but I'm sure you can get the tone out of Satriani's Peavey JSX halfstack, I mean thats his song afterall and I'm sure you can tweak the amp to get the sound.
I dunno but hes real good.
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sounds like a kinda hotrodded marshall sound. You might be able to wrangle a used laney gh50l and cab for that cash and you'd probably need some reverb/delay for Satriani.
Jcm 900's and boosted 800's would work with a midboost (I know, I have a 900).
Heard good things about bugera's but I've never tried one. Maybe a used Engl screamer?

Hope that helps somewhat
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