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I never read anything but bad reviews for the "upgraded alternators." Shortened life and low voltage at idle speeds seem to be the common complaints. A few companies make claims against the latter (IR Performance offers a S6 alternator upgrade) but I'm skeptical. Have you considered one of the "common" upgrades like a S6 (100A) or Ford Taurus (130A?) alternator? Based on the loads you listed there isn't much you can do to reduce them. LED taillights and perhaps a more efficient/variable speed e-fan are probably the best options.
I'm in the process of upgrading my charging system as well. My car has significantly less sources of draw. Outside of the "normal loads" the only additional loads are the electric cooling fan and cabin blower motor. My biggest issue is low voltage at idle due to the Racing Beat underdrive pulleys. I had a Banzai Racing alternator pulley but it was eating belts for some reason. I'm going to try a S6 alternator with their v-belt pulley next. Hopefully that will bring up the idle voltage and the extra current headroom can't hurt. LED taillights in the future too.
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