The green furniture is no big deal. You can buy green furniture and put it on any rifle or carbine you decide to buy. I have two green rifles and think it looks good myself.
I own a number of AR15s including lowers by Bushmaster, Cav Arms, Colt, Mega Machine, SGW (Olympic Arms), and Century Arms. I have never had a lick of trouble with any of them. Remember that the AR15 is very similar to the military M16. These are rifles designed to be used by the military in combat. AND they are designed to be easily repaired quickly and with a minimum of fuss. Unlike many sporting arms, the AR15 doesn't have a lot of complicated, or hand fitted parts. With about an hour of research, and only a couple specialized tools, you could build your own AR15 from the ground up. The point being that there is no magic AR15 that one company manufctures that is far better than the others. ]
Some things to look for in my opinion: forged lower receiver, chrome lined barrel and chamber, mil-spec parts, and a flat top upper. Unless you are going to be doing formal target shooting I would stay away from any "match triggers". I would also stay away from the Bushmaster Mini-Y-Comp muzzle brake.
If I was going to buy an off the shelf AR15 right now, it would be a 16" Bushmaster Flat Top. To begin with I would get a detachable carry handle, but would quickly transition to an Aimpoint ML2 optic. That, to me, is the best semi-auto 5.56 carbine out there.
I do want to add that I have never shot, handled, or owned an Armalite. I have heard nothing but good things about them, but have no personal experience.
I can tell you what the instructors told me at Gunsite. They recommend Colt. They say that this is the carbine which has shown them the least trouble. And this is not to be taken lightly. They see a few hundred carbines a year go through there that fire somewhere around 1500 rounds each per class. When I went through the Gunsite 223 class, I used my Bushmaster and it ran great. I fired about 1800 rounds in a week. Our class was split between Bushmaster and Colt (I dont' remember anything else being present). As far as I know, there were only two carbines that had problems. One of each. The Bushmaster that had problems had never been fired before the class. It's owner had little to no experience with the weapon. I don't know exactly what problems he had but he took it to the gunsmith. The other problem was with a Colt that was a very much used and abused loaner gun that had the bolt break in half. I also took the carbine class at Frontsight. Every AR in the class was a Bushmaster. No one had any problems dispite the very dusty conditions coupled with very high wind; not to mention the heat. In this class I fired about 600 rounds. My carbine ran flawlessly, and I used Wolf ammo for the vast majority of the course. Accuracy at 200 was terrific. No misses on steel at 400.
