Best ifs kit? rms, hdk, gt suspension, or magnum force?

Hi Chris (the Dukester)

I guess I don't understand....what do you mean "playing with spring rates"?
Changing them out. IE switching springs. I bought 275, 325, and 425 lb springs from viking to allow me to fine tune the feel and handling i want. Combined with the 375s the GTS comes with, this will let me adjust them in 50 lb increments.