Currently planning my 10 man team.

[Purpleflavor]

i'd definitely swap the spriest. The shadow debuff is too small unless you have 5+ locks. Warlocks are fine if you prefer them, but one lock for curse of elements (or even none unless you like the utility) and the rest mages is optimal, another reason to drop the spriest.

Looks like you're also running with 1 healer. Is that enough? I'd probably be too scared and go without at least 2. Maybe resto shaman instead of Ele, but you're almost 40 and might have better insight as to why i'm just a scaredy-cat.