If I could be allowed, I would like to continue flogging the deceased equine.
Somebody said that a smaller/lower hp 4wd could do the same job as well as a larger 2wd. Not always. I started plowing a 20 acre field with a
M6800 Kubota w/FEL, 4wd, loaded tires, etc. Rated at 62pto hp. Pulling 3 16" ford bottom plow. After the first couple of hours, I parked the Kubota and hooked the plow to my 2wd 6610 Ford. Rated at 72pto hp, just 15% more than the Kubota. The Ford, hands down, was smoother, faster, had less wheel slip, was much more comfortable to operate. The Ford would have pulled the 4 bottom plow.
Moving 1200 lb bales. One on the loader and one on the 3pt hitch=a real adventure on the Kubota. When you tried to pick up one of the bales on the loader without one on the rear, the rear wheels cleared the ground. Not so on the NH 6640, rated at 14 more hp. It handled the bales easily. Needless to say, I wasn't really impressed with the Kubota.
Sure, 4wd has some advantages some of the time, but it isn't the cut-and-dried proposition several posters seem to think it is.
Another thing: I am 58 years old. I just bought what will probably be my last tractor. A Farmtrac 535. Why did I choose 40 year old technology over the new shuttle/HST/4WD/cupholder/plastic fender models available? One reason: simplicity. I have my FIL's 1956 Ford 640, in good running condition. He made 40 crops with that tractor. It has had one engine overhaul in 50 years. It needs a clutch, because it is still on the original. I want my Farmtrac to last 50 years like the old Ford has. With minimal maintainance and breakdown potential. Four wheel drive would be one more something to go bad, to cause problems, to require maintainance. I wanted to get the 435 model, without power steering, but after test driving, I decided I just would not be able to handle it with my bad shoulders. I know, I know, I'm just a sissy.
As for the original poster: the key phrase is "I want 4wd". He should get it. But he would be limiting himself very little, if at all, with a 2wd drive machine of about 10 more hp.