If you want to save money get the Ls engine, don't go Vtec just turbo. The Ls is better for turbo because of the lower compression, I believe its like 9.5:1 (don't quote me), and it also has more low-end torque. A GSR has more stock hp, but also costs more and has higher compression meaning it won't respond to turbo as well, although it is still capable of gobs of power.