The second Marin and the Spec look quite similar in terms of the specs, but is priced more than 100 pounds more. Both have the necessary mounts for fenders and racks, and hydro disc brakes. The Marin frame does stand out over the Spec, as does the colour, so if your discount brings the price down to where the Spec is then go for it.

As far as fit is concerned you'd really have to try them out to see. My guess is that the smaller one would fit you better.

You can get a set of bar ends to give yourself a few more hand positions if you are dead set on flat bars. But as I stated in my first post if you go for longer rides or group rides then a drop bar is more ideal.