Who has the better running duo in NFC east?

[Ruhskins]

NFC EAST RBs RUSHING STATS (CARRIES/YDS/AVG/TD)
(after three weeks)

Washington
C. Portis 65/248/3.8/3
L. Betts 11/48/4.4/0

Dallas
M. Barber 62/285/4.6/4
F. Jones 18/148/8.2/2

NY
B. Jacobs 50/244/4.9/1
D. Ward 26/177/6.8/0

Philly
B. Westbrook 42/161/3.8/3
C. Buckha... 12/48/4.0/0

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I think if you look at the current performance of RBs, I would put Dallas RB tandem 1st, because of the amount of yds/TDs and they've played two good defenses (Philly and GB). I want to go with the Skins second, but Philly has played Pittsburgh and Dallas, which have good defenses, and they still put up 3 TDs, although not as many yds. The Skins are a close 3rd, due to the amount of yds and putting up 3 TDs, as with Philly, Washington's running game is just one player (Portis). Our team has played two average defenses (N.O./Cards) and a good defense (NYG). Finally, I would put NYG's RB tandem fourth b/c althougth they've gained a lot of yds, they have 1 TD to show for, and this is playing against teams like St. Louis and Cincy, which have weak defenses. Plus, we kept Jacobs scoreless, despite gaining over 100 yds against us.