I've been trying for over a decade to find a good spot in Nebraska. I outfitted ther efor 5 years and finally gave up. There are not many big muleys in Nebraska, but it can be a fun place to hunt. There are a few outfitters that have solid deer, but I don't know of a single rancher that allows trespass hunts and has good deer. The best thing to do might be to try the Game and Parks personnel and then the Chamber of Commerce in an area that interests you. I only live an hour's drive from Nebraska and I can't find a spot, so I can't make any helpful promises.
As is the case in most areas, the best places are leased by outfitters or held very closely for family and friends.
Good luck and if I can help, shoot me a pm.
ICMDEER