You can probably do that distance on a Jamis Commuter. It wouldn't be my first choice, but it's possible. I would disagree with what Jeremy said in as much as I think the upright position is a distinct negative factor for longer rides. It puts too much weight on your butt. That's not necessarily a deal breaker though. If you remember to move around a bit (any position is bad if you hold it too long) and lift yourself off the saddle periodically it will work OK. I agree with the suggestion to get bar ends.