My Westport is $280k, and the land was bought from Dominion when they went under so the lots where we are building are only about~$30k developed. The only difference between your mid-level builders (Westport, M/I, Trinity) and your high end custom developers (Donley, Romanelli etc) etc are your basic finishes and lots/neighborhoods. We went with quality mid level finishes. There are 2 of the same floorplan of our house that are over $300k.
There are only a few of the low end builders left (Centex, Ryan, Maronda) and they have not upped their game on their structure quality and just sell on sq footage alone