I'm running hks pistons and cams on a standard turbo aswell
(with 360° bearing), with standard injectors & afm, apexi piggybacks, uprated fuel pressure reg, walbro fuel pump and a decent set of plugs. It all depends on what you want from your car mate.
Just take it to a tuner and say:
"make it as fast as you can on its current set-up please sir" :lol: :lol:
And if you get bored of it get a bigger turbo, injectors, piggbacks/aftermarket ecu, maf etc. the list goes on mate, just check a few of the specs out in the members R's section.
You best let your chosen tuner give you advice on boost levels for your current turbo/engine
.