well, all of them are blogs or forums. But you know, you can change the functions on them, so you can redesign and rewrite a forum so noone ever will think it is a forum system. Same with blogs.
The key is customization: there wont be any standalone cms that doesn't seem like one of the lot. But if you spend time/money on them, you can customize it.
I believe wordpress is the way to go with a lot of customization and a bridge to a forum - that will create community and an outstanding design. Give it a try.
P.S: if you want a cms out of the box ready to use, you should simply forget to start the site. There are too many of those same look-a-like sites.