i faced the same dilema since about when S4 came out. Got the upgrades I'd saved for, then felt I really couldn't be bothered with the shammies for now. The way I see it, I'm not gonna dominate in Arenas (partner transferred anyway), and the gear they have is fine for Wrath. I'll probably come back to them and farm a few dailies/finally get my Shattered Sun rep about a month before Wrath. In the mean time, I've been levelling a 5th shaman rested so I've got a 5 man team to blast through Wrath content, and I've rerolled a priest, 4x hunter team on a new realm, which is super fun. Got my mounts yesterday.

I've always been one for the alts though, when I get bored with a char or group, I'll take a break for a bit, then come back when I feel revitalised.

Good luck with whatever your choice ends up being.

Ky