I would go with Hall or Nash. Scott Steiner could be fun if you can get him to go off on one of his crazy rants.
The only wrestler I would make an exception to meet now would be The Undertaker. Meeting these guys isn't that big of a deal though. Usually you get an autograph and/or pic with them and maybe you say a few words to each other and it's over. Not worth the time and money unless it's someone you really like or you're one of those wrestling obsessed fans.