i have a briggs and riley Huntington Rolling Brief #MRH531

It has a very long opening for the computer but also has a shoulder strap if you want to use it that way. It retails for $339 but can be found on ebay and such for $175

http://www.briggs-riley.com/product.asp?pid=112

I did alot of searching when looking for a rolling bag and found this to be one of the lightest well made bags around.

The only down side is I miss my backpack. I thought I could give it up, but I can't so I am going back to my backpack, however unprofessional it may look.