Well most cars have coil overs already.
I'm talking geometry like adj arms for caster/camber, oil coolers, upgrades radiators, brakes
You'll easily spend 3-4k just in that department alone. Pads & rotors will be $1000
You can then even look at getting lighter rims for unsprung weight reduction etc. Sooooooo many areas to attend to really before you need to go rebuilding a big motor.
No reason a motor won't last for many years if you keep the boost/tune/servicing in good order. So get a 3076, run say 14-15psi - should last a long time @ 250rwkw. The 3076 is probably a bit big for only 250rwkw, but the fact you'll be using low boost levels, less heat, wont come on like a lightswitch etc etc. Whilst you are learning to drive, is a pretty good idea.