Looking for suggestions for next mods
 

I am looking for ideas and suggestions for modifications that would effectively improve performance for street use for a reasonable price.
I am not into aesthetics as my car looks pretty enough as it is for my liking and prefer to spend into actual performance parts.

Right now I have:

Zspeed stage 2 clutch with clutch slave cylinder upgrade and lightweight flywheel
Zspeed engine splash guard
CJM clutch pedal assembly
Z1 cold air intakes
Fast Intentions high flow cats
GReddy GT Evolution cat-back exhaust
Mishimoto oil cooler
GReddy oversized oil pan
Z1 polyurethane motor mounts
Torque solutions transmission mount
SPL differential bushing
SPL subframe bushings
Bell differential brace
EBC brake pads
Stoptech braided brake lines

ECUtek tune might be a good idea.

A good LSD. Hotchkiss front bar. The rest of the SPL catalog.

Don't want to be an instigator, but my own personal hindsight: get the EcuTek tune, and no more engine mods. If you really want more power, just save the pennies up to get boosted, but I actually believe the EcuTek tune can leave you more than happy enough.

You've already setup a good platform to make the car more robust. Totally agree with Rusty about the LSD and suspension work. Maybe some added indulgence in between is changing contact points (seat, wheel, shift knob). Just keep it a proper driver's car.

edit: 4.08 final might be an idea that falls into place with you're doing both EcuTek and the LSD