In most case/PSU bundles, the PSU is generally crap (often both are crap) - especilly in the low priced ones. All else being equal, aluminum cases will be noisier than steel cases. Want to reassess your approach to a case purchase?
I can recommend the Arctic Cooling Silentium case/PSU systems. They are compact (but not as small as a true mATX case could be) and include a very nice Seasonic PSU (rated at 350W continuous, but makes lots of other 450W units look sick). The included fans should be nearly silent when you get them but are fairly easily damaged in shipping - if any are noisy, RMA them. I know SVC carries them and I think the Egg recently picked them up but use Froogle and other price search engines for best bottom line price w/shipping included.
And the CoolerMaster 541 is pretty nice - add your own PSU.
But if you really want quality Aluminum, Lian Li (50 series are ATX cases, but very compact) or Silverstone (SST-TJ08) have them. The Ultra MicroFly is very similar to the Chenming 118 or the Aspire X-QPack. The Aspire X-Sonic (nearly identical to the original Antec LanBoy) and the
Chenming 301 (which is also available in black) are some lower cost options. Very careful selection of components and fans plus some isolation techniques can help keep the noise down.
Even though the Aspire X-QPack includes a 420W PSU it is not very good. Almost always better to buy a case w/o PSU and get a quality PSU to meet your needs. Or blow the PSU out on ebay and get a decent one.
.bh.