Some thoughts before you get to wrapped up in getting WoW to play under Linux.
1) If you run into an issue with the WoW software, Tech Support will pretty much say you're on your own. Linux isn't supported at all via Tech Support.
2) YMMV. Some say WoW runs much better under Linux, some say it's worse. Just be prepared if it doesn't work as well as you'd like.
I'm thinking about giving it a shot as well, just to say I've done it. If I see a huge performance increase, I may run with it a while, but I'm not expecting great things.