You have quite a long commute, and as there are some hills you need to crush, I narrowed down the options a bit.

Giant Seek 0
Felt X-City 1
Kona Dr. Fine

None of them have a belt drive, which may be a bit more noisy and need more cleaning.
Though, they allow a more aggresive position which makes climbing the hills more easy and would lead to a higher average speed.

And as you will be able to harvest some parts from the old commuter, it's a good idea just to leave out anything you don't need. You might be able to spend a bit more on function that way instead of accessories you already have.