A rear motor mount should definitely be on the list. But personally I'd start doing suspension stuff before doing more engine breathing stuff. The CAI and turbo inlet both give good gains for the price, and while the TBE or a tune will also give gains, they won't be nearly as cost-effective. Getting noticeably more power than you've got currently starts getting much more expensive per HP.
Putting in a rear sway bar and maybe some Cobb springs will do wonders for your handling, and give a much better performance-per-dollar (and smiles per dollar) improvement. Also, a short-shifter w/ bushings is a great upgrade. These are things that improve your overall driving experience, not just straight line pulls.