If you are after a "respectable" buck, you can hardly go wrong with any unit with good public access. Really! There is a reason antelope success is up over 85% in nearly every unit in Wyoming. Since you are coming from Iowa, find something on the eastern half of the state. If you get the Eastman's MRS, pick any unit that is a "blue" or "green" unit with good access and you will have a really fun hunt. You will likely have a better chance at drawing a "green" unit, because "blue" units with good draw odds tend to attract more applicants.
Don't hunt the opener, generally hunting after the second weekend of the season, on weekdays when the locals are at work makes for a fun unpressured hunt.