You can try looking at www.arenajunkies.com. It's a site for high rated wow players and they're main forum is limited to players with a certain arena rating. However, they do have a certain section (Ask a Gladiator) where you can ask questions and the class forums usually have threads regarding gear and spec choices.
You can also try www.chardev.org; it's a website where you can tinker with different gear choices. Just pick a class, choose the gear that you currently have or plan on getting and then just tinker with gem and enchant choice according to the stats that you like. Warning, this can be highly addictive though.