I have been contemplating picking up an AR, and just learned that JP Enterprises (which seems by all accounts to be among the best makers in the world) is in Hugo, MN, the very town where my assistant lives, about 30 miles from here. Am seriously toying with going a little crazy and building a CTR-02. As it happens I've had a hideously expensive week (major car repair and new Samsung PN51F8500 TV), so may want to let the AmEx cool a little bit first . . .
If you have any mechanical skills at all, and I'm not meaning machining skills just assembling, do yourself a favor and build your own. You will learn 10x as much about the weapon and come to appreciate what a modern marvel it really is.
DIY can be cheaper but even for the same price it's more satisfying and you get to customize the feel of the weapon to you.
I'll give you your first lesson for free: buy things you're not sure about, like furniture, from Brownells. They have a lifetime, no questions asked return policy. There's nothing like it, in any industry.
It's like Newegg crossed with Cosco before they gimped their return policy.