Exhaust sounds good but with a single mod you probably don't need a tune yet. If you want that much HP your going to need Forced Induction. Here in CA, the Stillen kit makes a lot of sense due to CARB, but if I was in a state that didn't have inspections I'd really like one of those twin turbo 600hp setups. You might want to look into a set of MT Street radials for the rears, 4.08 gears and a LSD. The tires will cost you handling but they'll help a ton in the straight line performance but if you do the install yourself you could probably keep it close to your budget.
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