ummm i would get two of these:

http://www.newegg.com/Product/Product.aspx?Item=N82E16835185054

they are VERY VERY powerfull and they move a massive 133CFM (anything more then 90CFM is considered a BEAST, so you do the math :P)

ummm the only down side is that they are a bit load and you might wanna have some kind of fan controller on them or somthing. but they are really one of the best fans on the market.

FYI, for my build im gonna be getting 4-6 of these fans..... they are AMAZING!

Whoa there, those fans are reallllly loud. I have one, and even on the lowest possible speed setting it's louder than my other 120mm fan; plus it makes an annoying clicking sound. But if you have a fan controller, I suppose the noise isn't that much of an issue. And, it's 38mm thick (that's huge), so if you get one, make sure your case has space for them. 

They do move a ton of air though.

I also read that the Ultra Kaze was the best fan so I went ahead and got it for my very first build. Honestly, I'm not to happy with it, mostly because it's too damn loud! It sounds like a miniature jet engine or something. It was also too wide for the spot in my case where I wanted to put it (the front of the Cooler Master Elite 335). I had to unscrew the exhaust fan that was supplied and put the ultra kaze there, and then move the smaller fan to the front. So I have an ultra loud ultra kaze exhaust fan :|

DJ-you really need to read the bit tech review of that fan. It does provide a lot of airflow but at what cost? It sounds like a frign jet engine-

"The Ultra Kaze also emits a bizarre ensemble of three separate tones that clash together in an extremely irritating manner. Unless you live life wearing a pair of ear defenders, the Ultra Kaze isn’t worth buying."
 

http://www.bit-tech.net/hardware/cooling/2009/09/28/what-s-the-best-case-fan/4

so the Sharkoon Silent Eagle 1000 120mm is your best bet.

Yep if you like quiet cases- otherwise scythe gentle typhoon

Antec has a 3 speed jobber that is pretty cool:

http://www.buy.com/retail/product.asp?sku=10392747&listingid=34456198

You can switch it from 1200 to 1600 and 2000, and it's blue. :)

if i added and of these fans to my current system shhould i close my case window.

I'd try it closed and monitor your temp and fan speed and see how that works. If you have fan filters and leave the side on, it may reduce dust introduced to your system.