I personally would like to pvp mostly but get a few raids in on ZG/AQ again.  I think it'd be fun either way to try out our new specs with all the dps priests, fury/arms warriors and other talents everyone is playing around with.  FSE isn't known for the most by the book group makeup so pick what you pick, and lets see if it works in a raid setting.

Do what you think will be most fun for you in the next month or maybe even a build that has a little bit of both.