Basements, 3rd story loft, 2 stories on a slab. Having said that, it's very hard to generalize, because some people don't care about a basement, or don't want the walk up to a 3rd story, so the rules don't always hold true. Plus you are talking about 3 different price points.
The "wow" factor of the house is the most important, so look at the kitchen and master bath first, what upgrades are there, and the overall "roominess" of the feel of the house. Many times you win or lose the buyer by the time they walk in the door, as first impressions are everything, so the curb appeal of the front is important.
If the price is the same and the lots are both good, then I would recommend the basement over the 3rd story. Finally, you have to look at the overall price range of the neighborhood. Is the basement putting you at the top end of the neighborhood? That may not be a good thing, as you want to stay in the middle range of values.
Hopefully you have a great agent helping you out with lots of experience in the neighborhood you are interested in. They will be able to advise what the most popular property is when you are comparing several, for resale purposes. Don't rely on the sales pitch of the subdivision agent (if you are looking at new) as their job is to get rid of their inventory.
Katherine L. Morrison, CRS
Team Realty Group