You cheaped out on the single most important element of your computer?
you have invalidated any opinion you might have about building a computer :X
Wow, you suck at building computers, don't you?
Anyway, I do intend to replace my PSU in the near future. My situation when I built this was I had recently graduated from High School and people were throwing money at me. I ALMOST had $400. Almost. I think I was somewhere in the $380 and a little left over to get Spore Galactic Adventures. I looked around Newegg, slowly found all the parts I needed in my price range. My PSU is a 500watter, and hasn't failed on me at all. In fact, my entire computer hasn't failed except when I first started it up when it wouldn't boot to Windows. Fresh install later, I'm playing Fallout 3 and other various new to newish games on max.
The PSU is not the most important part. Really, it's the least important part, as it is easily replaceable.
And guys, building a computer always wields the better results. Compare two $400 computers, one you build your own, and one you buy from a name brand. The one you build will have significantly better hardware then what is almost a barebones machine that is near impossible to upgrade and shouldn't be running Windows on such low RAM.
Pros of buying VS. building:
You don't have to build it your self
Better then buying a similarly priced Mac (if that's even possible) or Laptop
Cons:
Generally hard to upgrade
You don't know what hardware is in there
To expensive
Generally filled with bloatware
However, I know of some people in my local area that build computers for you. While cheaper then buying it from a name brand and has what you want in it, it's still more expensive then building one your self. Hey, they've got to make money too!