OP, I see that you like classic lines & steel. Why don't you build up a nice fixed from a vintage frame? You certainly have the knowledge and can put the best on your favorite bike and be set.
Fixed/Singlespeed is truely an open book to what you can build. Crazy cool graphics laden CF to aluminum to cheap no-name mass production low end steel. BMX 3 piece cranks, low end 1 piece, stripped road rings. It really seems to be a personalized deal.
I wouldn't touch some "cool builds" with a 10ft pole, yet the love of my fixed gear life is about as low end and cheaply made as one can get. Ugly yet endearing. Hey, whatever gets you off, you know?!
Stock builds are generally cheaper in the end, which you know anyways. But I think you could build such a cool bike with the experience that you have, so why buy stock?

The bikes you posted weren't my cup of tea(maybe the Masi, maybe....) and I didn't see them as creme de la creme. But ranking bikes is hard. People stare at my CF bike and salivate. But it doesn't do that to me. Eh, get what YOU like. The rest be damned. We aren't riding it.