In no particular order, I'd like to see these people/groups included:
Andrew Bird--the perfect artist for Sasquatch--amazing music that's complex but hooky and accessible, does not fit into any genre, utterly original. Get A.B. and I'm over the moon, regardless of the rest of the lineup.
Ozomatli--they killed it a couple years ago, great music for the venue.
Manu Chao--ok, he played right after Ozomatli, but this is my list, and I want more Manu Chao.
Morrisey--never seen him, would make a great headliner.
KT Tunstall--maybe too poppy/mainstream for some at squatch, but I think she's great