Now that I've got the two 2013 VX Cruiser HO's for the wife and I, I'd like to pick up one more used ski for the teenage kids, friends etc.

Looking to spend no more than 3k.

Whats the best that you think I can reasonably expect to get? Would like a 4 stroke if possible. Doesn't have to be as fast as the Cruiser HO but something that would do 50 at least so they could reasonably keep up.

I'm I resigned to early model skis?