Choosing a Turbo Help
 

Been looking at a couple of turbos such as the Turbonetics Hifi 650, Garrett GT35r, and there is a guy here in town that can build a turbo for me that capable of 750hp and is a non ball bearing turbo. its pretty much Garrett clone for $750. this is my first time going turbo the type of power i like to put down is around 500hp in an rx8 which a qiuick spooling. i'm trying to justify the extra $300 for a ball bearing turbo and if others feel that it is worth it. any suggestions?