I raced my R32 GT-R at club sprints for years, only reason I stopped is because the car was too fast to race uncaged. Depends what your local tracks are like, I had to sped up on brakes cause my track is Symmons Plains. But with a R33 you can probably get away with std brakes +good pads, fluid , and rotors. If you can do your own work racing a GT-R isn't that expensive, but you have to keep the rebuild price of a RB26 in the back of your mind.
I loved that I could drive my 20 year old datson to the track with only upped turbo's, brakes, and semi's, and beat 997 Turbo's that had just come back from Fitzgerald Racing with a bill bigger than the purchase price, and all modifications of my car.
I think a R33 is the value for money pick on the GT-R's ATM, they are bloody cheap now, much more advanced electronics, stiffer chassis, and newer than a R32. With some mild mods it'd be faster that a S1x easy. And there has been many more SR20 falures than RB26 failues locally.