I don't think I've ever gotten more than 3 respect for a useful post. Oneliners and memes is where it's at (and fanfic and getting engaged, etc).
Aside from an overhaul of the respect system (something along the lines of splitting "respect" and plain "likes"), I don't think there's any way to make "respect" more tied to, well, anything relevant.
-> I don't think there's any way to check what your most respected post is, aside from keeping a running tally yourself. BTW, my second most respected post is a joke about how respect is not tied to your understanding of Dominion, how's that for irony.
EDIT: I notice that my writing style is incredibly poor. I've used "I don't think" three times in this post.