I have a set of the "large" avenir excursion pannier. They are pretty decent for weekend trips. I use them for tent camping, and they would be pretty large for CC touring unless you like taking comfortable amounts of clothes. Here is a picture of them on a bike from a camping trip a few weeks ago. They look very overstuffed, but it was cold and rainy so I was carrying a comfortable amount of gear. If you don't overfill them they would be pretty good for a weekend. I like outside pockets, but these do only have a flap with some light velcro to secure it. I mostly use them for bug spray, sunblock, fruit and candy bars, bandanas, stuff that if it falls out it not that bad, but so far nothing ever has.

One thing, the metal clips that hold it steady on the rack need to be bent to a tighter angle. They were a 45 degree slope when I bought them. One of the clips worked off the rack on some rough roads, but the plastic clip held it on very well until I noticed and fixed things. These are not bags that I would take across country with any thing like a heavy load, but I do use them as front bags for clothing and light things with my Jandds in the back for fully loaded trips.
Even though I just told you a bit about the only bags I know about, I have heard good stuff about nashbars, and would seriously think about those if you don't think that you will be using them that much. The price is better, not sure I would have paid 65 bucks for the aveniers. I got them for 25 at a surplus goods store.