Tri Sli question

I'm actually planning to do a tri sli with my 8800gtx ultra and I have a 900w PSU, is this enough to support my tri sli setup? And to add I may actually add watercooling would this mean I need to upgrade my PSU?

Heres the link to my PSU

http://www.newegg.com/Product/Product.aspx?Item=N82E16817814013

You don't seem to have enough connectors... but it should be alright to run.Bebi_vegeta

yeah I need to buy extra connectors for my 3rd graphics card that shouldn't be a problem, And thanks for your response.