|But it sounds like we have similar budgets for our 90TTs: Limited.
I went with Sport 500's because they were reasonably priced and were supposed to meet my power goals for a street car of ~450whp. Plus I picked up a used set for $1100 that I've been abusing for 9 years now.
I made around 430rwhp on 93oct with all the breather mods and 480 on E85. Would it be nicer to have ball bearing turbos? Sure; but it would have been considerably more expensive as I already had 4 bolt downpipes. I'm thrilled with my E85 tune and certainly don't need anymore power. If budget wasn't a concern I'd suggest going with a small BB turbo.