Ok, Noo, if you are going to annoy Trainshed, I guess I'll give it a go too. Terry, I don't think you made a bad choice in fans in terms of quality and performance, but I have a prejudice against temperature controlled, variable speed fans.
I'll decide when my system is cool enough, not some thermal circuit, and I'll choose the noise level I want. In other words, I want a constant speed fan and constant noise level. I just want the system to run as cool as possible consistent with my noise tolerance.
Intake fans? Just say no! This position always get me beaten up, so I'm used to it. For all the doubters, I'm going to post this link:
http://www.amd.com/us-en/assets/cont...docs/26003.pdf
Please read it before you react. Honestly, it continues to amaze me that the logic isn't fairly obvious to so many. You really can't push significantly more air into a case than you can remove from it. So if your exhaust system can remove 53 cubic feet a minute, there isn't much point in having a front mounted 120 CFM fan. The exhaust fan is going to pull air into the case from exactly the same ducts where an intake fan would be mounted. A 53 CFM exhaust fan will bring just as much cool air into the case as a 53 CFM intake fan.
All the intake fan does is disrupt normal convection patters, create hotspots, consume electricity , generate heat, and add noise. Plus, the additional fan noise is likely to be closer to the user than noise from a higher-flow exhaust fan.
So there!
But, Arctic Cooling does offer excellent VGA coolers. If your are concerned about GPU temp, buy one. You really can't do better.