im getting the viewtek one. its a better price and has 5 stars.
i hope you're not going my the buyers' reviews, they are idiots. if it works at doing a simple thing like show the desktop they give it 5 stars. if they use the wrong driver and have problems, they blame the card . .
You have to remember that overclocking increases heat, so you may want to consider getting a non-reference design graphics card such as MSI TwinFrozr, ASUS DC II, or Gigabyte's 2 fan design. Otherwise, if you have sufficient airflow and cool air into the case, then a reference (1 fan design) works.