Speak to Gus he will sort you out.
Mod lists are very personal but I would be looking at (in no particular order):
1) Remap + DPF & EGR removal (Gus @ Alfatune)
2) Alfatune Exhaust (twin exit) - wont give the towbar any issues (gus again)
3) Eiback Pro Kit Springs + shocks if you want to go the full tilt on it (B6's or Konis) (Ned @ Autolusso)
4) PF Pads, Braded Brake Lines & Super Blue Fuild (Speak to Ned @ Autolusso)
5) Powerflex Bushes (Speak to Ned again)
6) Tyres..... Its a personal choice but get some Performance tyres... Michelin, Goodyear Asyms, or Vredestiens etc)
7) Decat pipe (gus again)
Then Full LED conversion, HID conversion, Project Halo & maybe even a Cylon
(all info in this forum for you so get the search button working)
You may want to get a quote on one of your kidneys to fund the above though. I got a great deal on one of mine!