you'd be best to change the gear oil before you decide to fork out the cash for replacement gears and synchro's.
change it to Redline Lightweight Shockproof and you should notice a big difference
if your complying an R33 GTR now, my understanding is that you're required to have brand new standard Nissan brake pads fitted to satisfy the ADR.
in which case looks like you might have to fork out the money to Nissan for them