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Austin / Salt Lake / Los Angeles / Portland / Atlanta
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Ann Arbor / Chicago / Minneapolis / Miami
This seems to be ranked on eng availability, but in terms of actual city tiers it's more like
T1: SF / NY / LA / Miami / Chicago / Atlanta T2: Seattle / Boston / Austin / SLC / Portland T3: Minneapolis / Ann Arbor
I think Seattle / Boston can be T1, but then you'd have too many T1s. My logic was "do lots of people want to move to this city?" and I think the answer is "no" compared to the demand for the T1s.
I see your logic though, and maybe it's better to just have a T1 and T2.
Ann Arbor is so small and close to Detroit, it is odd to hear it listed as a significant city in its own right (like Madison WI). Heck, they are about the same close-ish distance away from Toledo, and Toledo is much bigger than Ann Arbor.