Tung oil or tung oil with varnish resins for a natural feel. How you sand it, and to what grit of paper will affect how the neck feels. I personally like a lower grit like 220/320 because its a little rougher. Then after the oilings I use a little paste wax. That's an EB/MM type finish, or like an old, "played in" Jem. Sanding to 600 grit will give a smoother finish, and is still great, I just like a rougher feel. It's a little "drier"
I like Defthane satin in the spray can for a thick satin finish. The satin isn't "satiny" enough for me, so I sand it with whatever feels right (220-400) for that particular guitar. It takes a long time to dry.
BTW I'm assuming it's maple. Mahogany is different.