I've got a few 100ks under my belt (no buckle yet, though!) and while I try to start with honey stingers and picky bars, homemade pb&J, and muffins... Torwards the end I do like to have beef jerky or bacon, and lots of coke and ginger-ale to suppliment the norm. I have done a few 50 milers with tailwind and honey stingers, but personally get really tired of it. I have used ensure during my last 50 and my first half ironman.
Best of luck at your next race!