vette8e6

I have a 90 gt vert with a GT 40 crate motor and 6 psi vortech blower. Car has been dynoed at 335 HP to the wheels. I need to replace the tranny with a new one. The one I have is stock and want something that will perform better for the street and track. I have talked to TCI, PA, and Lintech. What do you guys recommend? Please help, I don't want to get screwed and pay alot of money and get a crappy trans. I have been told to convert it to 5 speed, I really want to keep an auto! I have other manual cars in my stable! Thanks for any help and advice. E-mail Vette8e6@aol.com Thanks in advance, Joe