Do you have to tote stuff every single day?
If there's a place to stash clothes at work, you can do what I do. I haul in all my stuff for the week on Monday, using a bike with a rack.
On the mid-week days I ride the roadie. The only concessions to commuting are lights and a mirror.
At the end of the week, using a bike with a rack, I haul home the laundry.