Lots will chime in with any intermediate ski they've had good luck with. I'd start on ski-it-again.com Remember that kids will believe my re in a good looking joking stick. I've been looking to move a 64" HO, but as the kid is still growing, I'd be looking at a 66". Be sure the bindings are a decent set, and a good fit. Bindings are just as important as the ski. Next bet would be close outs and especially factory Blems. Try Overtons, Bart's, Ski Limited and water skis.com Good luck.
I spent most of my money on booze, broads and boats. The rest I wasted. - Elmore Leonard