When I'm on RDM, my main priority for raise is the healer(s) .. outside of that, I'll wait a few seconds to see if a healer uses Swift.. I just look at their cast bar to see what they're doing. If they're occupied with healing, I'll raise anyone else who dies. Oh. And if the healer is too occupied with his/her own DPS to rez an actual DPS, I'll step in. (And may or may not mention it after the fight, that in almost every situation, a live DPS class would contribute more damage than a healer. Ahem.)