Since you seem to have decided you want a short barreled (16") AR-15 and you still really don't know that much about them, why not skip over all this boutique stuff and buy a solid Basic rifle with a proven reputation.

I honestly can't think of a better gun than a Colt 6920. All this stuff about which trigger, stock, grip, etc. Is at best pretty much unimportant if you don't any real experience with a basic stock setup to compare it to. That rifle in it's stock form will run just as hard as hard as any rifle mentioned on this thread with accessories or not.

Here's another thing about Colt AR-15's, they hold thier value extremely well. This could be very important. With no experience you don't even know if this is for you.

Terry
PS. Still on the iPhone, forgive all the errors.