Off-hand weapon queryFollow

First off, I'm a level 64 combat/assasination rogue with maces as my specialty. I've always had a fast dagger in my off-hand because everyone says you want a fast off-hand weapon. My mace stun is pretty neat when it procs and I do all of my leveling with my boyfriend's rogue who's full subtlety.

Most of our PVE fights go like this. I cheapshot, he abushes and backstabs, I get in one or two sinister strikes and then hope I can get an eviserate before it's dead. He has aggro the whole time because of his burst damage, and my most useful ability to him is to stun the thing so he can stay behind it as much as possible.

With this in mind, and the fact that I can't find a fast off-hand mace, would it possibly be better for me to have two maces even if the off-hand one is slow? More stuns = happier subtlety rogue = faster kills? What do you guys think?

Wow, now that's a nice mace. Maybe I can get all my friends to help me on their mains. I heal for their alts all the time, after all. I think they owe me that much.

=P