replacement for the rear tires

After winter I'd like to put some new rubber on the back, seeing as mine are bald pieces of all-season crap. The front two are still pretty damn good, so what's the widest I can go and is there a type of tire someone would recommend besides replacing the stock ones(keeping in mind the fronts would be the stock goodyears) for the stock rims? Kind of a crappy question that the fountain tire guy could answer but you guys are my friends and he isn't you see.

mickey thompson E/T streets :D

hey they're DOT approved / street legal...