well if i was in your situation..
so new car, and 2K to spend
firstly, i would do a full service - oil, oil filter, fuel filter, spark plugs, clean the coils, clean the AFM, clean the AAC valve (do a search for more info on this)
then i would take it to a mechanic and give it a power run on the dyno to check AFRs and check the health of the engine
now, its already got some go-fast bits, so i might check if its a full exhaust or a cat-back, and if its only cat-back then i would finish off the exhaust
now on an r32gtst you can run up to 14psi fairly safely so i would adjust up to 12-14psi and seee how it runs
with the rest of the money i would get the windows tinted, and look for a nice second-hand set of 18" rims with tyres already on them
hope that helps
Warren.