Still, there are some decent options. The Schwinn Moab DS1 is right at $1,000, has full suspension, and comes with a surprisingly robust parts setup, including a Shimano XT rear derailleur and Hayes hydraulic disc brakes (www.schwinnbike.com). Here, you get a lot of bike for the money. There's also the Specialized Rockhopper FSR Comp, which goes for a little more than the Moab, doesn't have the disc brakes, but puts a lot of good components onto a very light aluminum frame ($1,360; www.specialized.com). K2's Attack 2.0 uses lower-end Shimano stuff, but it still puts disc brakes on a full-suspension bike, all for $1,000 (www.k2bikes.com). Personally, I'd go for higher-end components over discs if I were you, as discs add weight and cost to a bike, and really only offer a qualitative advantage over rim brakes if you ride a lot in mud.
You should also check the second-hand market. Look for bikes that cost $2,000 a year ago, such as the Jamis Dakar Pro. Then start trolling want ads, Web marketplaces, eBay, and the like. See what you can find. Spend $100 for a tune-up and new cables, and it'll be like a new bike!