A 750 is a good machine but why stop there. Go up to the 850 it is the same machine except that the straw walkers are 13" longer. I've owned two 850's a 750 and a 751 pull type. I would suggest a 1983 or newer model then you would have the hydraulic reel drive option. Mine has the 354 turbo charged, charge cooled 168hp engine and hydrostatic transmission. this gives you lots of power for almost all conditions.I run a 15' rigid head in wheat , a 20' John Deere flex head in beans and a six row corn head. In small grains it is the best machine on the market. If you are stuck on the 750 , spend the extra money on a grey cab model. Then you get all the bells and whistles the 850 has. The longer walkers in the 850 though will give you more capacity in wheat and barley. You will have no problem doing 400 acres a year, I can do 50 acres in ten hours in 85 bushel wheat if I unload on the go and put less grain out than any other make.