The best PSU IMO for under $80 is the 530watt Fortron located
here. Some of the most extreme oc'ers use fortrons because they simply cant be beat for the price. Another good alternative is the Tagan 480watt located
here. The Tagan has active PFC which should help if your household AC lines aren't that great, and active PFC will save you money on your electric bill over time.
Antec/Enermax is also nice, but in the price/performance ratio there are better PSU's out there like the ones above.