Umm, it's done 100k (probably more like 150-200) and you're not going to replace the timing belt??? You should.
If your coild packs aren't breaking down and causing misfiring then why replace them? I say wait until they die.
I'd consider doing the fuel pump anyway. Reliability mod. Get a 2nd hand GTR pump.
Oil cooler would be a good idea, radiator probably not necessary at current power levels.
If you are happy with the power level then wait until the turbo dies. It probably will at some stage, but maybe not for a while. After death, then go GCG highflow. Either that or sell your current one and buy a dead one for them to rebuild/high flow to offset the cost.
My R34 has no brake issues but I understand R33's do get some fade. I don't know if braided brake lines help there but I would think that it would be just as effective and much cheaper just to replace the ones you have with the same spec. Do you bleed your brakes often?
Maybe some other suspension work should be considered? Caster kit? Camber kit? HICAS lock?