I am one of those "low end" users. But I'm on my way up the Lumia ladder. Started with the 530, I'm using a 635 now and will be getting a 640 in a couple weeks. All within about a year. Am I in the market for a Flagship Windows Phone?.....not yet, but I'm not planning on stopping with the 640. When I'm ready, I would love to know that a Windows phone running WP10 will be there
You have specified unlocked vs. carrier version. I voted for $200-400 because carrier phones are usually subsidized for approximately $200 for a high end phone. However I voted again for "More than $400" because I plan on getting a high end phone and wanted my vote to reflect that. (Though I don't plan to spend over $400 because I'll most likely be carrier locked). Hope that makes sense.
I was only going to spend as much as my $17000 gold Iwatch on my next Windows phone.
It probably won't be a Lumia I know that for sure.