Well, I've got it narrowed down to the Lowepro Mini-trekker AW and the 400 AW.
I found someone who posted photos on flickr comparing the two with front, side and open view completed loaded.

Here's the link in case anyone else is looking for a new bag ...

http://www.flickr.com/photos/kentkc/3742411878/in/photostream/

Hmmm ...looks like it will be the 400AW for me!

Thanks everyone for the help!

Denise