VF48 or big 16g. The other turbos are nice, but I think they are small for even modest gains. I've run an 18g and now have an 18g-xt. They are great turbos, but IMO, the bang for the buck is greater with slightly smaller turbos, especially if you have stock block, etc. You should find a tuner first, and get their opinion on injectors, fuel pump, etc.