U.H.M.W.
I dont know what your willing to spend but this stuff is bullet proof and check out the site for specifics... http://www.crownplastics.com/pages/uhmw-pe.htm
I pick up my new Williw next Friday and it has U.H.M.W. on the bottom of it. Its expensive, about a 600.00 option but is garenteed to last a lifetime. They can install it at Koffler or Willie.