I upgrade my stocks mostly to get a stiffer forend. The stiffer forend definatly improves accuracy when using a bipod or front rest.

I have tried several styles and for target most have worked very well. I will say that the best 2 all around stocks I have used and still have both, are the now discontinued B&C Duramaxx, and the Factory Savage non-accustock synthetic with the slightly wider forend that comes on the 12FV and 12FVSS (and also on some of the Law Enforcement Series rifles IIRC). Both feel good in the hand, and both seem to ride my rear bag and rest pretty well and work well with a bipod also.