I'd check this out: http://easttexas.craigslist.org/bik/2380665931.html

A tad overpriced, I know, but this should suit your needs well (and given the bike market based on your CL page, it's a good find). I don't think you'll need a suspension fork, anyway, this'll be a lot lighter, and it'll last for ages if taken care of. Rigid steel mountain bikes are awesome. Just put on some slicks and go.