One firearm I've never owned is an AR-15.. and I want one BAD. Once I started looking... I realized there is NO end to the different makes, models, and acc's for these darned things! *I want a 556/223. *I want a carry handle..but I want to be able to remove it. (I've seen a couple that are part of the upper) *I'd like a Colt... but I know darned near everyone is in the AR game now.. is a Colt any better? Does a Colt hold it's value any better? *I definitely want to be able to shoot either 556 OR 223... Eventually, I'd like to put a scope on it..but it's not needed at first. I've read that the mags are the weak point.. what are the best ones to get for longevity?