EBR Disease
EBR disease is a horrendous yet wonderfully compelling disorder. I've talked with several who, like me, are afflicted, and all state the same thing - a crack addiction would be cheaper and probably easier on the personal relationships. My advise is to just say no. Walk away. Don't give in to the temptation.
But if you do, go find yourself a Rock River, DPMS, S&W, or Stag lower, then build it the way you want it. A little more expensive in the long run, but you spread out the cost and wind up with something you want, instead of spending twice the amount and having a box of parts that you took off your rifle to replace with all the goodies!
Seriously, just say no.
(you know where I can get that new Magpul back up iron sight? It's not for me, it's for a friend. No, really.)
*EBR = Evil Black Rifle