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As far as I2 vs. IA3, it is just parts and that draft box. $1,500 is a ton of coin for the draft box, because Ultegra Di2 is about the same price as SRAM eTap. But, that draft box is cool. I love mine.
I would go ETap over Di2 any day. It is so nice to get rid of wires, internal battery, and junction boxes. SRAM really caught Shimano napping on the wireless group.
The one thing you should check on rental wheels is tire/tube combination. I am betting they just stick a butyl tube in there. Latex tubeless or tubeless would save you more watts than the difference between the P3 and the IA. There should be a Slowtwitch slogan like "Latex tubes. Don't leave home without them"
Out of interest, why do you say etap and IA is a good combo? As in, is there a reason etap is better than di2 for an IA??
Soon I will have both and can give first-hand comparative commentary.
I briefly had etap setup on a tt bike. Yup, that blip box if huge. And while I'm sure it's not -that- bad to deal with, I really didn't love the idea of two batteries that had to be removed on a very regular basis to be charged. I also didn't love the feel of the blips, though the clics were awesome.
Di2 is just so freaking reliable, the battery charge lasts forever, so many choices for parts and widely available as individual parts (not always so with etap!).