$50 PSUs are fine, if they're decent. The XFX unit I linked is a good example.
OfficialExpert (that name could get you in trouble one day, by the way), you might want to tone it down a little. Most people here that I've seen (most frequent posters, excluding here-then-gone one question accounts) seem to recommend a good PSU.
That said, I wouldn't usually bother getting extra case fans. Stock ones are usually enough.