I can't see them ever dropping In the End or Numb, they're pretty much the band's biggest hits. Crawling I think could be rotated rather than a staple, but One Step Closer should, in my opinion, be in every set. It's just that badass.
Wretches and Kings should make a return for sure, it's possibly the best live ATS song. I'd also like to see Somewhere I Belong make a return, just to shake things up a bit.