Which would you suggest? Do you get more life out of a card with a lower cost upgrade getting a second one or is usually better to just replace the old with a new but more expensive one? I'm not one to need to completely maxed out settings on every game but running on medium and possibly lower on latest games on my 3-4 year old card. I thought SLI/Crossfire is mostly for hardware enthusiasts or when you need really high resolutions. Does that still hold true or is it a viable cost effective upgrade option?