OK - new at this - have a lovely ride and want to take the best possible care of her - so . . . .
Have just under 2,000 miles (in 5 weeks) -
Change now? Regular or synthetic? If synthetic is better, why isn't it recommended by Ford?
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I'd short change the first oil change, right where you are now with your mileage and then change roughly every 3000 miles thereafter. Why downgrade to regular or upgrade to full synthetic? Use what Ford recommends. They've done all the homework for you. They're using a 5w-20 synthetic blend which reduces cold start wear, lubes the upper engine parts faster than base oils and is priced lower than full synthetic oil.
Although I haven't bought an 05 stang yet I drive a 00 Dakota 4x4 with a 4.7L V8 in it. It runs 5w-30 base oil stock but I use 5w-30 synthetic blend for the winter in average 0*F to -40*F temps. The cold start turnover is unbelieveably better.
Check this site out for Motorcrafts oil products;
http://www.motorcraft.com/products.asp?T=2&M=15&PageID=74