The Scythe Infinity is one of their newest heatsinks. It is a massive cube (almost) and comes with its own 120mm fan thats quite quiet. You could always run it without the fan or swap the fans over.
It works on 775 and AM2.
If your American: here (although its not called the Infinity on newegg :? )
If your English: here
The Thermalright Ultra-120 seems good but expensive. In the UK its over £10 (~$20) more than the Infinity. Also you don't get a fan with it (possibly a good thing if you want to provide your own quiet fan). The Ultra-120 doesn't work with AM2.
The big typhoon was a letdown for me, cooling was barely an improvement on the stock cooler, but it was quiet.
In the latest CustomPC magazine in the UK (issue 44) they did a roundup of some coolers; the thermalright and the infinity both got 80% (for the 775) so there isnt much to choose from there.
The price difference is probably the only thing that should make a difference here, even if you want to add your own fan the thermalright is still £10 more.
UK shop for Ultra-120: here
US shop for Ultra-120: here
Also this all depends on what socket type your on, how much you want to pay, how much you are overclocking, and what country you are in (i don't know much about the US shops/prices as im in England).
I dont know about the extreme version of the thermalright. It might be worth something that the Infinity can have 4 fans on it, (for future cooling needs, incase of overclocking) and the thermalright can have two (although I think that might be overkill...).
My gut feeling (when choosing my cooler), was to go for the biggest, as the biggest cooler has more surface area and larger mass of metal to dissapate the heat through. Not one of the most scientific approaches to it but thats all I did.
I own an Infinity so I'm going to be biased towards that! Its a good quality cooler and I'm happy with it, even with its stock fan.
Aside from your question: You could always watercool your rig...The Zalman ReseratorI/II is passive, but it'll set you back ~$300 (well thats the price in the UK). Or you could spend $$$s on a custom Danger Den, or Swiftech kit. Its not exactly what your looking for though
I saw a review of the Thermalright Ultra 120 Extreme.....and the temperature was only ~1-2 degrees different than the normal Ultra 120. I still suggest the Ultra 120. It has some of the best temperatures possible with any heatsink; and you get to put whatever fan on it that you please.
About the Tuniq Tower I just realized it comes with a fan in the middle of it.
My questions about the middle fan that goes in between of the Heatsink are..
1) How quite is it?
2) Can you put a different fan 120mm in it's place?
3) And can you attach fans to it and how many if so?
4) What's the best setup fan wise attached and the middle wise?
Thanks very much for answers to any of the questions, or any comments.
1) Quiet. Not sure the exact dB, but I know it's alot less then 30dB. I cant hear it at all with my noise canceling headphones on, and they're rated to block noises up to 30dB.
2) You can replace the stock fan with an 120x25mm case fan, the most common variety.
3) Tuniq doesnt provide any hardware for mounting external fans, but with a couple cable ties it wouldnt be too hard to mount 2 or 4 more fans...
4) The best would be one of these on each side of the hsf, along with a high power fan in the middle. Although that would be costly, to the point where water cooling would be a better option. And it would be insanly loud.
Hey what about a Zalman Reserator or Reserator 2? They are silent and very effective cooling devices. If he got the Res 2 he could also cool his N/B and GPU; that would really quiet things down! Of course, the Res 2 is incompatible with 8800 series GPU so beware of that!