That's exactly how I arranged my rig
But I am wondering about the fans in your and some other rigs.
The cards (at least in my rig, 4 Sapphire 7950s) blow hot air into 2 directions:
1. to the opposite side of the cards as where the fans are, so through the bottom of the card and so unfortunately to the fans of the next card which suck in the hot air from the previous card
2. out of the back of the card.
In your pics it looks like you have your fans directed to the back of the cards. If you blow with your fans in the direction of the back of your cards, I think you blow the hot air back into the card.
So what I did, I put one large fan in FRONT of the cards to blow cold air through and between them , which works very well. Another advantage is that I need only this one fan to cool the cards, the mobo and the PSU.