If you're determined to make the Priest a DPSer, even in group instances, then it doesn't make much difference. DPS is DPS, and there are alot of synergies between the 'lock and Priest that makes it easy for them to work together.
However.... the reality is that I reckon you'll find yourself healing in some instances, no matter how much you protest, and for that you really want your Priest to be the main purely for situational awareness and nice mouse-over healing macros.
So, personally, I would choose the Priest as main, but not for the reasons cited by fearing because they're all solvable

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