Hey Fear I will put my .02 in. I am not a AR expert, but I shot them for many years in the military. I just bought and am customizing my first civilian model. I went with the DPMS carbine. It shoots very well, and is a hoot.
As far a Del-Ton, I have heard of them, only because of internet search. I have never even seen one at a gun show. That being said, unless you can get some good reviews from a couple of people, I would hesitate to jump into one. But for all I know they might be a very well built AR. Just my .02.