Scott-
So, first of all, good for you for focusing on buying an early Zenith EP !! They are awesome watches, and the EP is a fantastic movement..
Regarding the 01.0210.415, on the pro side: (1) It is still one of the early pre-1974 Zenith EPs. Made in 1973. 4,000 pieces produced; and (2) it is very affordable, particularly for a watch containing the EP movement. On the con side, obviously, It a less desirable model and case shape.
If you were to buy one of these, I would buy one with the original bracelet and end links. It is a bit different than the Zenith Gay Freres ladder bracelet on other early models. The first example in your list for C24 has the correct bracelet. In addition, there is a mesh bracelet with curved built-in end links that also goes with this watch, which is very cool. I have seen versions manufactured by both Gay Freres and Zenith.
If you are looking for a more reasonably priced early EP, I would recommend you consider looking at the A781 (Red dial), A782 (Turquoise Dial) or A783 (Sliver Dial with Blue Subdials) with their original lobster bracelet. They are very 70's and not everyone's cup of tea. But, I absolutely love these models and, while heavy, they wear very well with the bracelet. I think they are a much cooler option, and are more likely to appreciate in value over time (if you care about such things). They have lower production numbers (1000 to 1500, depending on the model). and have been appreciating recently, but good examples can still be purchased for ~$4k to $6k. Best of luck on your hunt!
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