
set-up looks like you are starting out right.
The down fall to your desires is everyone is minimum (12) weeks or longer wait time for a Rifle unless you find one in stock at a Gun Shop, Gun Show, heck the guy next door.
The obama panic has placed the gun-owners into defcon 2 and everything is being bought at a alarming rate.
My best advise is start buying the parts and build one, that will be the fastest way for you to obtain you AR.
Manufacturers I would recommend are:
Charles Daly
DPMS
RRA
Double Star
CMMG
With the heavier bullet you are wanting to shoot I would go with the 1/7 twist.