I have also tuned my stock 02 GTP last fall before I started adding mods. Mainly because I have HPT. Now if I did not have HPT and had to pay someone else then I would wait for the pulley drop. If your stopping at the mods you listed then go ahead and get it tuned you will see a gains with those mods. As for the 160 thermo I would return it for the 180.
EDIT: I forgot to add now I have the same mods as you except a 180 thermo so if you get it tuned by someone with HPT Message me and I can send you my bin file with my current tune.