sorry I missed the thread update and the forum isn't sending e-mails anymore.
I've decided to keep the HTA 35R and convert it from .63 to .82 like Rob said. I just don't see a better turbo option out there right now that meets my requirements.
The T4Z HTA88 adds way more lag than it does hp and the FS635 would be a minor upgrade, not worth the expense/hassle to me. I'll wait until something much better comes along.
*edit* found my new turbo, it's for sale again