Hey, I used to ski on a 2005 Obrien World team Slalom. I free ski a ton,but I am trying to learn the course whenever I can get access to one. 1 year ago I bought an H.O. Omni with the fixed fin on the back. It is completely different ski--a lot better. The World team is very very stable which is fine if you want to go straight, but not very good if you want to turn. Before I bought the Omni, I put the fin all the way forward, and moved the bindings way back from stock, and it was better...... but the Omni is way better The Omni turns very easy. I haven't had many chances to run the Omni through the course yet, but the few I have it is so much better. It is also so much less tiring free skiing too.
So I would buy the Omni, or one of it's comparable competitors like the Radar Union Jack. I would make sure that people have run whatever ski you buy through the course recently, and that would rule out the Obrien World Team.
Good Luck.
Rip