I see a lot of posters like Bushmaster. The only thing I know about Bushmaster is that one that blew up and almost blew a friends wrist off. You should see what it's like when a thirty round magazine gets set off.
And I have seen a lot of the "purple" Bushmaster rifles. I don't know what causes quiet a few of their receivers to look purple.
Having said all of that, I would like to have at least one, or two of each, of the major AR manufacturers rifles. Could be a lot of fun.
When you get into which is the best of anything, rifles or what ever it is, it usually becomes a Ford and Chevy discussion.
The AR-15, that is the best for you, is the one that has worked the best, for you. If you want to know about AR-15's, go to http://www.ar15.com/
as these guys really know their AR's.
I, personally, have four AR-15's now. Two AR15A2's and two CAR-15's. I would hazard a guess, that the other major manufacturers have made AR's that are just as good as any of my own.
In addition, I have three flat top uppers also. Two are 20" models and one is a 16" model. These uppers are Colt manufacture.
I will be buying more AR's this year. At least two, maybe three of which, will be from Les Baer. Pricy, but nice.
I am also looking real hard at the M1A's too. The high-end, camouflaged model, looks like need to have rifle. If, for nothing else, than just fun.