There are 2 different 5000 series cab tractors, the E Limited and M series. M series will be the high spec units with multiple trans options, but similar powerplants (the 4.5L engine is not a new powerplant to Deere). The E series are the value specced tractors but still have high end features like wet clutch and open center pressure compensated hyd. but only offered with the 12x12 trans. E series also are a cab only option, 4wd only option. Where the M series can be open station and 2wd so there are more choices when speccing out a M series. Check out both versions as much as possible and drive them both if you can.