Ibanez RG321 modded, meaning changing pickups, tuners, possible pots, knobs be good? as in a "real" guitar.

Or would a used Rg550,rg1570,rg570 be better?

or a schecter c-1 classic?
RG421 FTW. It looks cooler.
Peavey 5150, Squier, Ibanez RG2EX2, Yamaha F150, Ibanez RT150, MXR noisegate
You can make all the componants just as good or "better" but the build quality of a Japanese RG will pretty much always be better.
Carvin DC127+Custom Lacewood Build+Godin SD--->Traynor YCV50BLUE

My Build IT'S DONE!