need to fill WR and W/R spot. always WHIR

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This is for my team in my sig (.5ppr, everything else yahoo standard)

So i have two spots open for either Smith CAR, Mason, Walter, Felix Jones.

Before Week 7, I was thinking about benching Smith and going with Mason(WR) and Felix Jones(W/R) but now im not so sure becasue Smith looked like he could get it going (judging only by the box score) and John Fox finally put Delhomme on notice so Jake might show up to play for his starting gig. Add the fact that they play ARI, which could get ahead very early and Mason plays a good denver def. Thats not to say that ARI plays a bad defense either, which makes me even confused. How many touches will felix jones get? And what about Walter? Buffalo if anything has a better secondary so im pretty sure ill sit him. Im confused about the other 3 ahhhh! so i need some of your guys opinions.

Which two to start?

WHIR, always