Bell & Carlson Duramaxx for the stock... Barrel options are limitless. Adams & Bennett, EABCO, Shilen, and other all make pre-threaded and chambered Savage barrel. Then if you just went with a blank, WOW the options on makers!
And like Chris said, the barrel that is on it probably not too shabby either. If you're just looking for a heavy barrel, it would be worth joining over at savageshooters.com just so you could shop the classifieds. Savage heavy barrels come pretty cheap over there (think $100-$150), and can usually be had unfired from the really serious shooters that buy only for the action.