There are a lot to choose from, especially if you are willing to go out of spec.. I'd probally use GC if you are ok with a 30 weight. In a non-spec oil, Mobil 1 10w-30 High Miles (A3-spec). If you drive a stick shift very hard in the heat, maybe the M1 10w-40 HM or Rotella Synth. I'm shure the AMSoil guys will chime in too.
I'd probally use a 15w-40 or 10w-40 dino and change often. Money is not an object, but I feel that dino at 5-6k works better than synth at 10-12k for the same or less money. See, I like changing oil, so.... Plus the fresh oil has new friction modifiers and such, clean and smooth and cheap. Heck, if Motorcraft 15w-40 HD has a lot of boron like their PCMOs, that would be high on my list.