These should work out well for you. I have the Back Roller Classics that I use for commuting. One pannier carries my (larger) laptop and assorted accessories. The other pannier has my clothing and lunch. If you think you'll be commuting in the dark at any point, you may want consider the new hi-viz line from Ortlieb. I'll be checking it out when I add a front pair for some touring.

View the Front-Roller High Visibility (pair) at http://www.ortliebusa.com