I prefer Mid-Pines to Pine Needles...I read somewhere that Ross was asked to design Pine Needles as a "Championship" course and then the owners across the street wanted Mid-Pines to be more of a "local" course. If that was the case, mission accomplished, Mid-Pines is like a walk back in time. Now that they're owned by the same group you can't ask for a better day of golf.
We've stayed at Pine Needles, comfortable rooms and nice food. Old-style rooms and lodging, more of a resort feel, whereas Mid-Pines (haven't stayed there) looks to me to be more of a 6-8 story traditional hotel. Don't know if your wife plays or is looking for stuff to do while you play, if so Pinehurst Resort (spa, shopping etc) might be the best bet for you both. But play these two courses!
My fifth course on your trip would be #4, old Ross but with more elevation change than #2, and a pond in play on a few holes, still with some turtleback greens and fun challenges. Others likes 7 & 8, but not me -- when I'm in Pinehurst I want to step back in time, and those two just don't "feel" right to me. Enjoy your trip.