Yeah, take a look over on TDIclub. Lots of good info.
My own personal opinion, wait for a near enough gtg to see Jeff Robertson (Mr. Rocketchip) in person or mail your computer to him if you can't make one. I've driven almost all of the different tunes and his were by far my favorite (along with a huge majority of TDIclub's favorite). The last time I saw him we were up till 3am tuning my unusual setup. IIRC we tried 11 different tunes. He refused to stop until it was "perfect".