-HAL
Me? Push SLi on you? Never!




Seriously though, if you can afford it, SLi really is worth it. I have 2x7800GTX. I can still play most games with everything turned on and this is a 2 year old card. You can count on at least 20% FPS increase.
One caution however your case says it comes with a 400W PSU. That may not be powerful enough, espicially if you go SLi. You will want at least 600W.