Raleigh, North Carolina
According to citydata there were 1024 single family houses permitted in 2010 with an average construction cost of $201,600.
That jives with this which I coincidentally just foundhttp://www.byoh.com/costtobuildahomeinraleighnorthcarolina
"By acting as your own General Contractor you could reduce the estimated cost to build to $209,316 and therefore the cost per sq. ft. to around $103.31 per sq. ft
According to Zillow, the average selling price there today is $165,500 for single family (condos bring that number down further). It shows the median sales prices coming in at about $106 per square foot (about the price it costs to build a new home).
So it looks like the land and infrastructures are pretty much selling for free with purchase of house.
You guys aren't in as bad a shape as we are in Florida by any stretch because here you get the land and infrastructure for free as well as getting the building for under construction costs. It's a freaking joke. A bad one.
Still, it indicates that you don't want to put very much into your home in an attempt to increase what someone might pay.
My guess is that you want to just do things that will not discourage someone from buying such as removing any creep factor, makes sure everything is repaired, clean, painted and looking good.
PS. As to the person mentioning granite. Totally depends on your neighborhood. If you do go stone (which I don't suggest), go directly to the suppliers as they are undercutting retail now just to push product. I recently did a kitchen and bath vanity for at least 40% below retail plus they threw in the kitchen and bath sinks for free.