That's the jist of it.
NEA always seems to be out of stock.
Cadex seems good quality and easy to get from Oneshot. They are a bit up there in price.
ATRS is damned cool, but you'll need to mortgage your house, and they are proprietary.
They make them to such tight tolerances that they are only guaranteed to fit with the matching ATRS uppers.
Dlask are supposedly good at what they do, but busy. I jsut ordered a Dlask. Said the next batch will be ready to ship by the end of next week.
Motiuk are the new guys, but no one has had anything bad to say about them. The price is right so they seem to be selling like hotcakes and are currently out of stock for the next 4-6 weeks. They also offer customizations for the same price as others base units.
I read somewhere that Blueline is made by Cadex and that all I know about them.
Same with this one other, Socom Supply, I think.
For some reason Dlask appealed to me. There seem to be the right combination of naming aesthetics, reputation, quality, and the whole, supporting a small local business warm fuzzy kind of feeling.