Due to the way the Shadow tree is laid out, it's very hard to pick up many of the useful PvP talents while also being able to reach and spec into the useful PvE talents. I'd really recommend not trying to mix them, you're likely to end up with a build gimped in both PvE and PvP. That said, I've seen a PvP-specced and -geared Spriest put out decent numbers in Naxx-10, but she's a General from Vanilla and knows Spriest inside-out and 10 ways from Sunday.

Thanks...my priest is now level 69 in Northrend and should hit 80 soon enough. I plan on disc healing at 80 and want my second spec to pvp with but would love if I could do some deeps in a raid if needed, looks like that might not be the case...

Well.. the PvP talents are ImpScream, Silence, PsyHorror, and Dispersion. That's 5 points. You're also have to have at least 50 points in Shadow to pick up Dispersion, so no cherrypicking.

This is my general raiding spec:
http://talent.mmo-champion.com/?priest=1403203100000000000000000000000000000000000000000000000325023051223010323152301350&glyph=000000000000&version=9767

ImpShadowform is included in there since I keep the same spec for soloing... and it's nice when raidwide AoE doesn't take huge whacks out of my cast timer.... so you need about 5 more points.

I took them out of Inner Fire, ImpDP, Shadow Power and Twisted Faith. It will bring down your DPS measurably, but it should be.. workable. I'd encourage you to give it a try.... and please post your results. :^)

http://talent.mmo-champion.com/?priest=5003203000000000000000000000000000000000000000000000000325023251223110322142311331&glyph=000000000000&version=9767

Thanks! Do you have a twitter or any other way of contacting you in the future; I'm still 70 but would love to get back to you once I hit 80 and mess around with specs.