I've come across this nifty link:
http://bicycletouringpro.com/blog/bicycle-panniers/
It's not an exhaustive list, but I'll just look through them when I get the time.
Now I'm leaning toward a double pannier. I was just wondering what pros/cons the attached/detached pannier systems serve for those that tried them? I noticed some have locking mechanisms, too. I'm just a bit paranoid about theft.