One guideline to remember is that many real estate types advise plunking in around 1% - 2% of the total resale value of the home for upgrades in the most important places to make the home worth more - specifically, kitchens, bathrooms and family room. Hardwood/laminate floors are big too right now. Also the best thing to do when selling is of course to de-clutter and pack away as much as you can without making the house look too empty and to neutralize the paint colours with some nice warm neutral.
Good luck on getting your place sold and enjoy the move closer to home!