Longtime lurker, first time poster! (Yes, my wallet is already weeping)
In downtown Minneapolis in the past two months I've seen two pairs of Grado SR60i's, two ATH-M50s (one of the Grados and M50s were even on the same bus), I've seen a pair of the Philips Cityscape Downtowns in the skyways and some V-Moda M80s. A girl that catches the bus at my stop in the mornings to work suddenly started wearing some Sennheiser HD 202 II's very recently. Also, I swear I saw a guy wearing some UE iems (don't remember which ones) on the bus last week. I've seen a fair number of different Sennheisers over the past summer too (an HD558 and an HD598 for sure) when the weather was warm. Thankfully, I don't notice many Beats among the daily business-class commuters.
when i was last in the big city i saw only m50s