I have played on all three tables you are talking about, Shelti makes a good solid foosball table but it lacks the speed and limits the shots you can do. Forget doing a snake shot on a Shelti the figures foot is to wide and the action isn't there. As far as replacing Shelti men with tornado i am not familiar with that. I own a coin-op Storm and wouldn't trade it for anything exept a T2000 Tornado.
Good Luck