Jason, If you're harvesting corn and soybeans I think you'll be happy with the single rotor design, but I can't tell you whether the standard or the specialty rotor would be the best. You may want to ask some of your neighbors what they are running. My preference would be the specialty rotor with Gordon Bars installed over at least the front portion of the rotor (it takes 12 bars on a 2388 I think). This kind of makes a rotor with the best features of each design. I would also install the Estes Disruptor bars if you ever cut your beans before it frosts and the stems are green and tough. Make sure you get keystock grates and a chopper. I think the major thing you are trading off by leaving the cylinder _ walker machine is the ability to fine tune the threshing by simply adjusting the cylinder speed and concave clearance. Other things being equal, the single rotor design will require more hardware changes as you go from crop to crop, but this is probably not a factor for you unless you plan to cut wheat, barley, etc. in addition to your corn and beans. With the Axial-Flow you may need to switch concaves and _ or grates according to the factory recommendations, which is a pain. A great way to get around this is to use the large wire concaves with every other wire removed for corn and then use Gordon Cover Plates when you are cutting beans. The more cover plates you put in the more aggressive the threshing gets and the less separation you get in the front of the cylinder. It's quick and easy to add or remove the cover plates and it can really improve the performance of the machine if the grain return is getting over loaded. If you ever harvest very high moisture corn I think you'll be impressed by the reduced cracking by the red machine. Best of luck