You don't really need more camber in the rear (for stock-ish tires anyway), you need camber adjustment. Most effective is the SPC lower arms, IMO. Any offset bushing is a gigantic pain in the ass.
Crash bolts up front is the the cheapest, but realistically camber plates are the better long term option if you want tires to last.
That said, my OEM Primacies held up very well on track with the factory alignment. Literally not even touched since it left the factory with terrible camber and everything.... YMMV
