Boomkins are a bit tough at higher levels because of the moonfire/sunfire thing but they are playable. When I 10-boxed I used only boomkin for dps and did fine, just takes more time setting things up in IsBoxer.

If you want lots of fun, dual hunters or dual locks sound really fun. I wouldn't worry though, you just started and you'll probably create teams of each eventually. Thats the fun part.