If you were to assume that Bushmaster and DPMS were equal in quality and price, I'd still buy the Bushmaster because DPMS has pulled some truly unpleasant stunts on people. One specific instance is the four position selector package. (Safe, semi, burst, full) It was designed by a gunsmith as a project and he put it in a few rifles. DPMS got hold of one and stole the idea and marketed it without giving a penny to the guy who invented it. Sure, he SHOULD have copyrighted, trademarked, or patented it, but he was a nice guy. DPMS just TOOK it and started making money on it without so much as a 'thank you'. Subway rat bastards.
I wouldn't buy a screw from them.
Colt: Sure, they know how to make a good rifle, but the sear block is a lame idea with no point to it, and their open backed bolt carrier is equally stupid. How many people have EVER installed one of those conversion kits or lightning links in an AR-15 bolt illegally, anyway? Not more than a handful, at most.
And you can buy genuine M16 pattern carriers any time you want to, anyway. And let's not forget Colt's equally stupid large pin fire control components, either.
It looks to me like Colt HATES customers that aren't buying hundreds of guns at a time.
CJ