yea im preaty bias and i would say the sc unless your getting the newest m3 but thats not the case here. its hard to get cars to turn like the 3, i would suggest a nice set of coilovers and sways and you will be cornering flatter and faster. bolt on turbo kits are available and reliability isnt really all that compramized, just you need to pay more attention to oil, temp,pressure and things like that. you can make a good 350hp to the wheels with low boost maybe 8-10lbs? but the kits are about 4-5grand so total cost is a factor but in the end you will have a car thats faster, looks better, and maybe even handles better but it will definitely ride better.