Your AeroCool PSU may be fine for a mid-level system. However it has no PFC - power factor correction, does not have the power for SLI or Crossfire on better GFX cards, and only mediocre efficiency - meaning you might use about 10% more power over the life of the unit - which can more than offset the lower price. Also note that it only has 4 SATA connectors. A couple of optical and hard drives will max it out - but it might be enought for you. The Corsair 520HX mentioned above has 4 SATA connectors while the 620HX has 8.
The PSU was reviewed by JohnnyGuru.com - a very reputable site. Here is the review and their summary.
http://www.jonnyguru.com/review_details.php?id=16
SUMMARY:
The Aerocool Zero dba 500W is a nice little power supply for a single PCI-e or lower end SLI or Crossfire machine (like dual 7600's or dual X1300/X1600 cards. The fan is quiet and the controller knob works well, and if this is for a computer with a big window that shows off the insides of your PC, then the super shiny chrome finish and black sleeved white cables will look fantastic.
Good...
Looks totally rad, dude!
Stable voltages
Modular
Fan controller keeps fan from spinning while PC is idle
135MM fan is quieter than typically used 120MM fans
Fan only connectors
Bad...
Simply not enough power or PCI-e connectors for high end SLI or Crossfire
Mediocre...
No PFC
Mediocre efficiency
Cables are very stiff
I recommend going with a more efficient unit - you might consider this list (note that it includes the Corsair that others recommended above):
http://www.jonnyguru.net/forums/showthread.php?t=1460