I have both top quilt and under quilts from Enlightened Equipment, there are literally dozens of brands to choose from. I have been very satisfied with the quality, performance, and weight of the down quilts I bought from EE. Enough so that I have purchased both a top and under quilt for my wife too.
I am using a Revolt under quilt and an Enigma top quilt, both 40 degree for myself and a 40 degree under quilt and 30 degree top quilt for my wife.
Certainly not inexpensive but whenever I try to buy something bargain I end up selling it at a loss to buy what I wanted in the first place. Unfortunately, this quilt episode was one of those experiences too. I figure with reasonable care, they will outlast me.
Brad