What kind of riding do you do?
There aren't many good $1000 FS bikes out there. It depends on what you do. Most bikes in that range tend to be heavy and have cheaper components. If you are riding XC, look at an Iron Horse Hollowpoint Sport or Jamis Dakar Sport. If you are into FR then consider a Diamondback XTS (I recently saw one on sale for around $900). Lastly, if you really don't want to spend more than $1000, you should look into used bikes. Try mtbr.com, pinkbike.com, or ebay.com. All have good bikes - at significantly discounted prices from new ones. Good luck.