having three different classes for your first team is rough, but doable.
just make sure they specialize in what they do. priest heals, warlock dps and warrior tanks. thats it.
i would have picked a different dps, as the warlock doesnt offern much in terms of buffing for the warrior. still, dps is dps, though you might be annoyed at the squishiness of the warlock and healer. otherwise, you have yourself a decent group that should burn through most quests and grinds with no problems.
also, i've heard bad things about WoW+SLI. check up on that and see if you might wanna take your video off SLI.