@AllanonsWrath: We'd never be able to keep up. As it is, keeping the place clean and orderly sucks up time for the mods and I. And I don't like having large moderator teams, as I've seen too many sites that do and there always seems to end up being power-trips and abuse at the moderator level (a big threat to a site's stability, IMO). The main thing that is lacking is a reasonable scoring system. It would even be reasonable for us to handle assigning the rank, but there's no good method to keep track of who's some of the more consistent and reliable "good advice givers". One thing I also want to avoid is just having me or the moderators deciding what is and is not the best advice. As a community site, "best advice" has evolved over the years. I do think a system where the community itself somehow helps determine who are the "best helpers".
@MissT: True. OP's may not actually know which was the best advice. So, then we'd have to come back to having other members judge it, and then we come back to popularity contests. *sigh*
It's a tough problem to find a solution for. And I'm not sure there is a great answer to it.