Specialized is a good company, but if you ask me I wouldn't want disc breaks on a bike costing less that $1500. When you're looking at bikes in the cheaper ranges especially (sub 600) it's foolish to get things like disc breaks or rear suspension -- because at low prices, those features are just being used as gimmicks.
Having disc breaks on a 500 dollar bike is just trying to draw in the consumer, while a pair of decent v-breaks (rim breaks) would probably suit you better (discs can be bent easily and ruined, generate rub when not adjusted properly, and are heavier). Without the discs, more money can go into spec'ing nicer drive train components which are important.
I have a Schwinn Homegrown Limited (Full XTR, SID Race). I used to race it, but these days I've pretty much turned into a full fledged roadie and have been road racing exclusively for the last three years. I still know my stuff though about mtn bikes, and could probably still hold my own on a trail...
- Maurizio