Jb4 is the simpler solution, pushes more out of your turbo. The unlock is a more complex and powerful tuning solution. Up to you how in depth you want to take it
I think you just showed me my next sports car O.o. UNLESS I pickup another Supra. My prediction is that in the next 10 years there will be drop-in engines for the mkv that shit on the B58. And hate to rattle people's gears but the easiest solution will be to drop it into a 2.0