I've had both my DPs done at Profit exhausts and they were pretty good and reasonable. Promotec sent their stuff there, and so did CPi if I'm not mistaken. They did a full exhaust on my friends G7 Gti.
SW... If you are planning on more than just DP then go for a remap otherwise just get a chip from rennzport and leave it at that. As you can always sell a chip when you sell the car you cant sell your remap.