Remember that we checked off boxes for 3 columns, fluid width and widget ready. We should be seeing only themes that meet these criteria. However, before selecting one, always read the details, as some get mis-categorized.
I'll be showing you a site and some themes expressly designed for real estate in a bit. I will not be selecting from that site for the reasons I'll give you with those images. However, one of the most important selection criteria for me is the efficient use of the available screen area. Remember that all sizes of screens will be accessing your site, and you want as many of them as possible to see as much good content as possible. Large top headers with big images are, in my opinion, a huge waste of valuable screen space. I'll be selecting a theme with little wasted space at the top, though pretty pictures may look better. Your site visitors aren't coming looking for a picture, they want information.