Cleaning. Make the kitchen sparkle, and make the bath so clean that a kid could drop his gum and put it back in his mouth without you flinching. Regrouting, replacing worn and discolored vinyl, cheap and makes a big difference.
Remodeling for resale is usually a pretty stupid thing to do. No matter what you upgrade, it just pushes some other neglected part of the home up the list. And, in plain language, most homeowners don't have the skills or the taste to undertake a remodel for the resale market.
$1000 bucks isn't much, but if you can make that home livable on the inside, you're in good shape.