It's funny, I'm also in an 8 team, 6 point Passing TD, 1/2 point PPR league through work. Also more convenient, I have the third overall pick too so I've been debating the same thing myself.
Ive ran a couple mocks simulating getting a QB first (Rodgers or Luck) or going RB first (Charles or AP). This is what I discovered:
There is a huge disparity between the top tier RBs (AP, Charles, Bell, ect) and the second/third tier RBs (Ingram, Stewart, ect). With QB I don't see too much of a difference between an Andrew Luck and a Tony Romo, Drew Brees, or Russell Wilson; all guys you can get 8th round or later which by that time you've established depth at RB and WR.
I wouldn't be too worried about the two extra points you get per passing TD. At the end of the day it's all about touches. A QB is dependent on the WR/TE to get his yards whereas the RB can have a great game and not catch a single pass from the QB.
In summary, I would go with the RB first and grab a good 2nd tier QB in the middle rounds. Just remember to handcuf your top RB. I got burned last year when I drafted Charles and could not pick up Knile Davis.
Hope it helps BennyHanna and good luck this year!