That's ok. The commuter I bought had drop bars but it should be a simple matter to switch them over to flat bars. So don't limit your choices since you can set up a bike the way you want it, not just the ones on your list.

That said, look at the single speed Broncks Black. Perfect for a 5 miles commute, minimalism and made in America:

http://www.bowerylanebicycles.com/broncks_black.html cost: $595 with FREE shipping in the continental US.