I wan to get one of NVidia's 600 series GPU's but should I go with a more expensive motherboard so I can do 660's or 660TI's in SLI or should I go with a less expensive motherboard and get a 670? And which model should I get?
I need to upgrade to 16GB of RAM because I do HD video editing for work and I constantly run out of or close to the 8GB of RAM doing edit and listening to music. I'm also planning on just matching the RAM and getting 8 more GB.
I find that if your target resolution is above 1920x1080 you should be going with a 670 or higher. I think you would be fine with a 660ti either the MSI twinfrozer ones or the Asus DirectCU II would be the ones I'd suggest.
SLi uses a lot more power typically adds additional heat to your machine and doesn't always equate performance wise across every game/application. Only reason why I'd suggest one card 660ti or 670 in my opinion.