A friend of mine is selling off his '72 SS454 Chevelles and getting a 2011 Mustang. He's going to order a base GT with cloth interior and the Brembo brake / 19" wheel package and a manual trans. It stickers for $32K but he has found around $5K in discounts by being in the Mustang Club of America and his wife is a recent college graduate.
We've discussed the gearing. low gear is a rock climbing 3.61 and standard rear is 3.31 with optional 3.73. Normally the 3.73's would be best but with a 1st gear ratio of 13.46, can't imagine there is much traction. The 3.31 ratio would be 11.95. I'm not sure how traction control figures in this as I'm just an old school kinda guy.
And if a supercharger ever gets added then the 3.31's may be better.
Decisions, decisions...and always best with somebody else's money!