I ended up going to the local bike shop and it changed my mind about what kind of bag I wanted. I ended up getting a Jandd Mountain Wedge II. It sits right below the seat and isn't too big and ugly. The triangle frame bags were just too small width wise. Thanks for all of the suggestions you gave.
One more quick question, I saw a bag like the last poster posted that holds a cell phone right on top of the handle bar frame. Do people listen to music on trails and roads? I would think that would be bad idea or maybe they just use them for map directions. The bag I saw at the shop was a cool idea. Thanks again.