Similar setup to what I use, just swap the priest for a shaman, couldn't justify gearing up another healer when I have such good resto gear on my shaman. Works pretty well in PvE, you can CC the shit out of most instances. Can be a bit tricky once the mages get gear, they can pull aggro pretty fast if you get some 'lucky' crits. Hope it all works out for you though, definitely renewed my interest in the game outside of raiding, nothing like figuring out 5-mans when you're running your own group.