I'm putting together a new system, E6400, Intel 965 motherboard, one hard drive, one dvd drive into an Antec NSK4400 The system is using onboard everything so the only thing needing cooling is the CPU, I was thinking of putting a Zalman 7000-Alcu on it instead of the retail cooler and using the tri-...

I'm surprised to see that the Yate Loon and the Global Win Ceramic bearing fans were not included, I know you have some

It's hard for me to say, I know that my VF900 running at 12v is louder..
I'd go with the 1200rpm, or even the 1600 and just use a fan mate with it.
I have my 1200rpm on a fan controller and leave it @ 5v and when I game or encode turn it up.

Enermax Low noise 120 x 25mm Fan Model UC-12AEBS http://www.coolerguys.com/840556025252.html is the only fan you listed with open flanges. The S-Flex fans http://www.coolerguys.com/sff21.html do too. Definitely go with the Ultra 120, I had a ninja on my 3.6 Prescott with a 1200rpm S-Flex and was get...