Looks to be a great build.
My only suggestion is actually going to save you money! *gasp*
Instead of that OCZ power supply, I'd pick up
this Enermax. It'll only save you ~$25, but hey, thats still $25! That powersupply is extremely reliable and is recommended not only for sli but also your motherboard specifically in [H]'s own PSU section.
Also, have you thought about a 120mm fan for that ninja yet?
Check out the Overclocking section here and search for 120mm fans and you'll find a billion results as to what you should look for. Currently I've got
this fan strapped to my Ninja. Remember, 25mm thickness or less, otherwise you'll need to fashion some paperclips or bands to strap it on there. Same goes for the 92mm fans, search in the overclocking section and you should find some suggestions.