I think everyone here has pretty much summed it up; especially More Impatient. That was awesome info. Me personally i am trying to build an all motor LS, reliability is a big issue these days. To turbocharge a car the "correct" way you should probably look at spending a little over 3G's. (correct me if I'm wrong anyone) But I think an all motor LS is the better choice simply because of it's larger displacement then even the GSR.