Hold out for the 5.0. I have an 06 3v with the 4 speed and 3:73 rear end, and it's so so. I think I get about 14 mpg. My dad has the identical combo and he claims 18 mixed driving. They are both on the turd-ish side of the spectrum. I know that we didn't buy race cars, but still.
They do tow very nicely, however. My dad had an 02 with the 5.4 2v and ran it until a little over 300k with little maintenance. Plugs and a couple coils twice. The spark plug problems on the 3v motors have always worried me, but whatever. I've driven the 5.0 and the ecoboost, can't go wrong with either, IMO.