I'd do a Chip, J-Valve, Filter and that's about it. Oh Yeah Chas Bar (or whatever he is calling it these days... )
I personally don't think you are going to get anything out of a CIA system, but I have never used one on a 1.8t. I have the above done to my car and it's a very fun car to drive. All those are only about 800-900 total so you'll have a little extra cash left over to boot.