Well it really depends on what you want to do..

Do you want to allways be able to go a 5man etc. Where you have your warrior tank and healing prist on him?

Or dubble dps as you said, but then you will have to work on geting a tank and healer for a party..

Or do you wanna go pvp? And for pvp melee ir really hard to get working out nicly.. But there is a way you could do it.. And that is to setup a voice control on your prist and play your war normaly, but then you need two comps..
Or maybe easies would be Mage and SP.