The neforce 680 is suppose to be a very good overclocking board. Do you really need a raptor? Personally I would put 2 x seagates in there in raid 0, but some people don't like that, too much risk of losing date, but you could get a lot more space for the price. Unfortunatly I have no experiance with that RAM but I believe it is suppose to be very good and highly overclockable.
Rest of the system looks pretty good.