$500 below MSRP is a great price for that rifle, and much closer to reality. Still, you could build a similar rifle for a few bucks less, and learn a lot about the AR-15 along the way. You could easily do it if you got most of the parts through the EE.
It's up to you, though, there's a lot to be said for instant gratifications [:D], and if you have the $$, then go ahead and get it. Now, if there's an 8 week wait for delivery, then that's another story.
M&A kit: 450
Mega Lower 130 Shipped & FFL
Firsh Handguard 100
Ace Stock 125
Ergo Grip 20
Flip up Sights 150
You could save the shipping and FFL if you could get any lower locally. I left out shipping on some of those items, so add another few $$, but your still right around $1000 this way, which gives you some more options.