I decided to go with a concrete floor- A plank style floor is considerably more expensive than concrete. Not only that- but the people who were going to install the floor were not going to do it appropriately.
The major issue right now: When the pad was made (using runner crush as a final application) the area was not graded properly and/or it was damaged during snow removal prior to erecting the poll barn. I believe the contractor will re-grade the pad. Afterwards, more stone will be brought inside and a 4" concrete floor reinforced with fiber will be installed. So far, I have not been guaranteed the pad will be graded. If not, I'll have to see what can be done to make them do it.
Moral of the story: When getting a building constructed, make sure you KNOW how it's supposed to be constructed! I am not a carpenter or mason and have been putting in time learning how it's supposed to be designed and built. Some good advice has helped as well. One more thing: When in trouble, get several estimates to get the job finished and/or repaired.