One of my daughters boyfriend has a 2006 Specialized Rockhopper Pro Disc., frame size is 19 with 26 in wheels. hasn't seen much ride time at all. He would sell it for $600. For specific specs, you can look to the specialized website, the '07/'08 model has the same specs for the most part, the main differences are the rims and fork. This particular bike has Sunrims and RECON fork suspension.

I have pictures,if you'd like to see them, email me.