The CTS will work but it's a hassle changing between corn and beans. Better combine than the STS (my opinion) if you don't mind spending quite a bit of time setting up for corn. I run mine in wheat, beans, and milo and get along great.
With the amount of crop you have to harvest and being a one man operation, I would suggest looking at a 9550 with the big motor and use a 25ft draper or full finger platform and a 8 row corn head. Then put a 50 to 60 bushel hopper extention to get more field time. If your area has a lot of soft ground get the 44 inch floater tires with the big rear tires. A set up like this would be adequate for a 2000 acre operation.