If you do not want JD then go with NH. They are about the only two with parts support. Gehl is getting terrible on the non skid steer Ag stuff. So steer away from them.
Look on TractorHouse:
NH 281 units for sale
That should tell you something.
Try to go with a NH newer than the old 717. The 782 and 790 are good choppers that parts are readily available for and the value is not sky high.
Keep in mind the days of pull type choppers are numbered. The farms are bigger or the smaller guys using a custom harvester. So the pull type machines are a SMALL part of the market. I am afraid that when this Ag economy tanks and the Equipment Companies get hurting, the low production stuff is going to get cut.