Nvidia 3D surround system: $4000 to spend

Unless you are water cooling, I don't think the Cosmos is the best choice. Those two GPUs are going to put out a ton of heat and you will want the best cooled case you can get. If it's a question of style go with a Silverstone:

Raven2
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Fortress FT02
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Or a CM HAF:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

if cosmos is not good then what would be used according to you..


Water ionizers||Ionized water

They got good results with the Cosmos.
Nvidia is pointing to this article.
http://www.fudzilla.com/content/view/18329/1/
http://www.youtube.com/watch?v=DgmSVIp3LII

Thanks for the input guys. I would go through a few reviews for the cases and then decide which would be most suitable.

Also i wanted to ask, should i spend a bit more money and get those high precision Keyboard/mouse? Do they have any significant advantage?

That was a single card, and the Cosmos S, but yes it was OK. There are other considerations than the GPU temp however, such as ambient case temp and CPU temp.

I do like the Cosmos and simply said it would not be the BEST choice. 2 cards will dump probably 150% the heat of one card into the case, and having a good stream of air passing both cards on it's way out of the case should make a nice difference.

I like my G5 mouse because it's weighted to my preference, mostly. The precision is probably not something of which an old man makes good use. It has however been INCREDIBLY long-lived. The finish has been worn off and still it functions perfectly.

Back-lit keys are a nice gaming feature.

Case / PSU - Antec 1200 w/ CP-1000 $259 (saves $40) .... The two optional fans blowing air on the vid card is a sound addition
http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...

Two Optional fans for vid card cooling$30
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

MoBo - P6X58D $310 (adds $140) I wouldn't invest $4k in an ASrock system....this board gives you USB 3 and SATA III connectivity as an aid to SSD and external storage for all those movies.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

RAM - OCZ Gold 6GB (3 x 2GB) DDR3 1600 Model OCZ3G1600LV6GK - CAS 8 is good buy at $160 .... CAS 7 are $200 now except for the Gskills which have very tall heat spreaders which will interfere w/ many CPU Heat Sinks
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

HSF - Prolimatech Megahalems w/ IC Diamond TIM, twin Scythe PWM fans and PWM cable splitter $100
($65 for the HS, $7 for TIM, $11 each for two PWM fans and $7 for a Y cable splitter). This gives you mobo control of heat sink fan speed and will lket you OC to 4.2 - 4.4 Ghz on air.
http://www.frozencpu.com/products/8807/cpu-pro-01/Proli...
http://www.frozencpu.com/products/7038/thr-41/Innovatio...
http://www.frozencpu.com/products/10026/fan-639/Scythe_...
http://www.frozencpu.com/products/8418/cab-150/FrozenCP...

KB / Mouse - Logitech MX-518 ($25) and Logitech G15 ($60)
After 3 sets of wireless KB's / Mice.....I am back to wired ... tired of batteries and "reconnecting".
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I realize this would be pushing the budget but if ya can wait .... can usually find specials on these for about $230 from Dell .... every 3 weeks or so ...watch techbargains.com and fatwallet.com
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Jack, you might want to keep this link around for blue fans:
http://www.jab-tech.com/120mm-Fans-c-81-p-3.html

Yate Loons are incredible for the price... I use the lowest RPM ones and they are dead silent but push enough air to keep my CPU at +10C idle (water cooled of course).

I have snipped the LEDs on mine so that they just glow from the UV CCFLs. The 4 LEDs per fan were a bit too bright for my system.

Prolimatech recommended 800 - 1200 rpm and all the Loons in that size range either pushed less air or made more noise.

I turn the LED's off