If you're going "solo" 10 man, you're going to want every benefit you can get.

Mix and match toons until you get everything. It is possible to over stack Shaman and just brute force it, but I wouldn't suggest it.

And I'm pretty sure you can 5 man MC/BWL/ZG/AQ20 (AQ40 twim emps and Cu'thun are stupid though)