Hey, I just got one as well! Still working on getting it up(have it half up and if it quits raining I can finish it)............I got a 26'x48' with a 12' high ceiling for some of the higher farm equipment I am keeping in it.......I also opted for the garage door on one end and enclosed end on the other.
Mine will be for truck and tractor storage. Oh, got it from FarmTek

It is better built than what I pictured for sure. TAX FREE TOO!