The case is not of very good quality and the PSU is plainly inadequate, having only a measly 24A on the +12V rail. Look for something else.
For a good-quality inexpensive case, look at the Cooler Master Elite series.
PSU-wise, quality is what matters most, not the wattage. That Corsair PSU I recommended before is of better quality, and has 41A on the +12V rail, despite its total power output being lesser than that of the Broadcom PSU.
The choice of PSU will also depend on how much power you need on the +12V rail. This is affected primarily by your choice of video card, and secondly by your CPU choice. HDDs and fans also draw power, but not as much as the other components.
Video card vendors usually state a minimum +12V current rating for a system containing the video card. This rating is usually extremely conservative, and is for a system containing a high-end quad-core CPU. Some vendors also factor in OCing and this is why different vendors specify different current ratings. So you can probably go under the rating by an amp or two, provided the PSU is of good quality and you have a low-power CPU.
Hope that isn't too much info for you!
EDIT: Scroll down on
this page for an excellent list of reliable and unreliable PSU brands.