I stayed with my tbitz efi when i rebuilt my 3 to a 3.2SS and couldnt be happier. Took car to europe last year and it performed all i asked of it... hung with new audis and bimmers on the bahn
http://forums.pelicanparts.com/porsche-911-technical-forum/494094-targa-sicily.html
Great flexibility, easy tuning, and hey, the price cant be beat.
I tuned the car to use the stock common plenum, and milder cam but with SSI, so i lost some hp this way, but the torque and throttle response are great
http://forums.pelicanparts.com/911-engine-rebuilding-forum/494048-3-2ss-ms-efi-dyno-results.html