You're so indecisive. Get what you want out of the car. My suggestion would be LS/Turbo just because it's cheaper and gets you the effect you want. I don't think you are aiming for like a 10 second car or anything. GS-R turbo requires more work when it comes to turbo, a whole lot more tuning in comparison to an LS. But this is your car so you make it how you want it.