You guys ought to give Uthgard 2.0 (revamped DAoC classic + SI + old frontiers) a try when it's finally back up. It's an old MMO, from EQ's era basically, so alot of things tend to be similar, but it has a great pvp system in place. Check out their site @
uthgard.net or the thread I made in off-topic if you're interested.