which Alpha Core MI2 is the one to buy?

Alpha-Core is the company.

Goertz was the designer.

MI is a prefix for their copper speaker cables.

AG is a prefix for their silver speaker cables.

Both the MI and AG come in different gauges.

1's are 13 gauge

2's are 10 gauge

3's are 7 gauge

You can order the MI-2's in two different versions. Either one will give you a 10 gauge copper cable. The difference is in the internal cable geometry and the type of dielectric used.

The MI-2 Veracity is the "old style" that uses two wide & flat conductors stacked on top of each other with minimal dielectric.

The MI-2 Python is the "new style" that uses four thinner "purled" conductors stacked on top of each other in a round package with quite a bit more dielectric.

I am assuming that you want the MI-2 Veracity's. The Python's have not been out for all that long nor have i seen any rave reviews of them. Sean
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Sean, thank you very much. I understand completely now.

I have a pair of the MI Veracity 2's and 3's . I have tried other brands along the way but these just seem to make their way back into the systems. I am done looking for good speaker cables - I have them. Good job by Sean as usual.

Ditto Ligi - the MI 2's are the best I've had, perfect explanation by Sean.