Thanks for the many responses. I ended up taking my bike to the local bike shop so I would be sure that the panniers would fit my bike and that my heel wouldn't hit the bag. I paid full retail ($100) for a set of TREK INTERCHANGE PANNIERS and felt a little guilty about spending that much. However, in the 10 days since, I have been very pleased with the purchase. It turns out these bags were made to fit on Trek racks (which I have). There is a "quick lock/release" button that allows you to simply click the entire bag on or off the rack. It has been a very nice, time saving and convenient feature. Furthermore, the bag is rugged, spacious (2,520 cubic inches), and quality built with lots of storage and compartments. The guilt is gone. Here's a link:

http://wheelandsprocket.com/site/ite...om_SB2&ID=1374

Fortunately, my local shop didn't charge the $129 listed here. Hahaha. Anyway, thanks again.