I can't recall what the lift capacity is of the JD FEL. It will lift higher than the PT400 series. You will have to keep some weight on the rear, like a large box blade or a ballast box, or, perhaps the snow thrower. That really seems like a good price for the JD, as the mower and snow thrower are several thousand dollars worth of equipment. Do you like any of the local JD dealers that would be performing any major work for you? JD parts are available nationwide and, as I recall, the JD4100 was the only 4000 series that is completely yanmar assembled... could be mistaken. That is a good thing... I think they all used yanmar engines, but all of the 4000 series were assembled in the US with the exception of the 4100. You'd have to research that to make sure I'm not leading you down the path with incorrect information. There were reports of front axle problems and turf scuffing on the larger 4000 series tractors, but, as I recall, the 4100 was pretty much complaint free. I really was leaning towards it and probably would have purchased one except for the fact that all of our local JD dealers were not too friendly and unwilling to come out from behind their desks to show me the tractors like it would sell itself or something. Also, I concluded the PT was the right choice for me in comfort and versatility. It has a much smaller footprint than the JD and I needed to use my pickup truck to transport it between our properties, the little league and the church. It fit in the 8' bed of the truck with an attachment hanging out the back. Couldn't do that with the JD.
If you decide to buy the JD4100, you can always resell it for just about what you paid for it. They are great machines with great re-sale value. I doubt you will lose any money on the deal. Tough decision, for sure.