I really want to like Intellij since it is so much more responsive then Eclipse, but I can't for the life of me get a working scala set up in IDEA or in the community version. Eclipse might still be a bit of a sloutch, but it works.
I think the current issue is with SBT 0.13 which isn't supported by them right now.
(I am not saying this is a good idea, but I am saying it "just works".)