No probs Scott.
Something i always try to remember is having a small amount put by for incidentals.
Common things that if anything will go wrong are :-
AFM's playing up...and sometimes their connectors
Coil packs breaking down
ignition modules playing up
Intercooler pipes blowing off
sheared head studs...
These are all very seldom, but recurring problems i have encountered over the years in mine and other peoples...always helps to have a bit of spare cash just in case. The parts and labour are not cheap.
There are some heavily tuned cars on here, and some heavily reinforced wallets to maintain them, however, when you are at the lower end of the scale, it's very easy to get carried away and it's like being a kid in a sweet shop...unfortunately i can only ever afford the 10p mix up, but its cool and i like it. so be happy with your GTST, enjoy it and more so..look after it.