Eurodyne with a custom dyno tune. About the only real option for non off the shelf setups like a K04. I kept going back and forth on this when trying to decide on what turbo I was going to get.
Other option would be Etuners with Dr techy, Eric (Eurocars) can help you out with getting in touch with him. I've heard good things but haven't done too much homework on them.
Yes, I will be going to Autuning and getting a Eurodyne - dyno tune.