The Antek SLK3000-B/SLK3700-AMB and the Compucase 6A19 are all basically the same design and among the best re. noise and cooling regardless of price - see more info on coolcases.com and silentpcreview.com . But they can be a bit cramped esp. for long add-on cards.
. The Evercase 42x2 series is equally good, but you often have to buy the HD vibe damper cushions separately - check with your reseller to see if yours includes them. You can buy the dampers direct from Evercase if your case doesn't come with them, but only over the phone, by mail or fax. These are also reviewed several times (4252 and 4292 both as part of systems and separately) on silentpcreview.com . The 42x2 chassis is at the core of the Asus Vento, if that makes any diff. to you...
. And if you want Aluminum, the Kingwin 424 series (also sold under the Beantech name by SVC.com et al.) is a good starting point. The only one I know of for under $100. that's made of 2mm Al. Thick Al is good for noise as Al is inherently noisier than steel. And Al is easy to cut if you need larger fans

...
. I think it wouldn't be too hard to tweak the Silverstone Berserker for silent running too. See my review on
TechIMO . Its cooling potential is already quite high OOB. My Duron 1600 runs at 35C and the system is at 31C (RT about 71F) with a random 80mm exhaust and a random 120mm intake and another random 80mm as cross flow on the HDs. Eventually I'll get some silicone isolators for the fans and move the HDs into an isolated cage in the bottom bay. And this case definitely is ROOMY! It is available from newegg and a few others. Silverstone says it is still a current product but usually only sold to system integrators now. No sign of it on their web site any more... The mini Berserker is gone forever.
. The overall quietness and cooling will depend on using quality components like Panasonic wave bearing or YS Maglev fans as well as a rheostat based fan controller (pcm fan controllers can actually add noise depending on the fan), and isolating noise sources from the chassis. Even though the case options I suggested are among the best OOB, they can still benefit from intelligent tweaking.
.bh.