Overall your build, The board, processor and memory should all work well together. About the only worth talking about is while the Intel® Core™ i5-2500K does come with a HSF (heatsink/fan) that does work well at normal speeds; before you overclock this processor you are going to want to get a good 3rd party HSF.
one more question
will my antec 300 illusion handle sli with that fan? or is it gonna be too small?
i am thinking of getting cooler master storm scout at microcenter for $60 after rebate
or do you recommend any other case?
that is a great case. one question, red led shows on the side?
I couldn't give you that answer for sure, but from what I've read and seen in reviews, it seems that the light from the front 200mm fan should not be bright enough to light up the case or be visible from the side window.