A new Delco 6'8"x24' gooseneck steel Bar Top with tarp, 2 center cut gates, and Rumbar floor with 9,400 lb payload and GVW of 14,000 lbs will run about $11,000
We've got a Duraline with a wood floor, I wish we had gone with the Rumbar floor, but I forget how much that added to the price and just went with wood. Rumbar floors have a 20 yr limited warranty not to rot. I think the Delco trailer warranty is only 1 year, so I'd make sure to check with them as to if they will give you the 20 year floor warranty or not.