I have my EQ setup but I'm sure it could sound a lot better.. I like a bit of bass, but only when it's supposed to hit bass.. and I like really crisp sound otherwise. I had a good EQ before re-installing windows but I can't seem to match it again..
There REALLY isn't a one-size fits all. Your headphones/speakers and your music style will both influence the best EQ curve for you. My own settings tend to give an overall boost towards the low end, although things get just a little muddy if I crank the very-bottom end. I find too much high-end starts ruining the percussion.
I'd suggest going through the pre-sets until you find a few that sound good, and take note of what frequencies they're enhancing or ignoring. Slide each band up and down the full range and list for what parts of your music change from it, and work from there.
i7 2600K | ASUS Maximus IV GENE-Z | GTX Titan | Corsair DDR3-2133