We have underdrive pullies and went with the PA Performance alt. They recommended not to change to alt pulley as it's almost the same size as most underdrive alt pullies. More importantly, it'll void the life-time warranty of the alt.
The PA Performance alt is pretty easy to install, you should go with the 4g with inline fuse option, the additional amps will be fine with this wire. You do have to change some connectors, but in reality this fixes the OEM connector Ford uses as they've been known to cause problems. You may or may not have to modify the alt bracket to accomidate the addtional size. A little time consumming but not hard.
If you go with underdrive pulllies, I recommend a 130alt.
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