Just finished the Long Walk last night... Spoilers of ending in post

Feeling a great mix of emotions about the ending. At first I thought he really hadn't won and there was someone we didn't account for, or that he just hallucinated Stebbins or someone else getting their ticket. Then I realized that it was him tipping into insanity, unable to come to come to terms with the walk being over, perpetually stuck in a contest which he already won.

Anyways, what do you think his prize would have been? What would you ask for?