My goal is to have a system that'll allow me to game for the next three years or so. I may also consider adding an additional video card for SLI later on down the line. My case, HDD, and monitors are fine. I'm also not much of an enthusiast, so I'm not interested in overclocking.
Oh crap! I didn't see you were planning to SLI. You aren't going to OC right?
Sorry, didn't read what you said properly. Are you sure you plan to SLI? I wouldn't right now since the newer cards are supposed to be more efficient and 2x stroner which are going out at the end of the year. The 560ti will last you about 2-3 years of gaming as long as you are not picky about getting it on ultra settings.
If you do plan to SLI. At least 700w is required
Get the i5-2500. Use promocode.
The K series are for overclockers
What I do to is google video card name guru3d review. They give you the watts you need for your system, They overestimate it most of the time by at least 50w so I subtract that and get the watts needed