best quality ar-15

hey there everybody. Lately ive been thinking about buying an ar15, except the price is really expensive. i wonder if it would be cheaper to buy a build it yourself kit. any ideas or tips would be great.

Which manufacturer or manufacturers are considered the best? I am interested in a 20 inch barreled variant, have not decided on flattop or carry handle, although I am leaning toward carry handle. I have been looking into DPMS, Rock River and DSA. Any thought on these, or other ones that I have...