Nice review and very good product indeed. Zalman is obviously making quality products. I owned the Fatality version of the VF700 before I switched to W/C and it was doing an excellent job cooling my 7800GT.
I bet that the 900 would be my choice if I had to move back to air cooling at the moment.
One thing I would just like to add is that although Zalman has good products, their customer support is extremly poor not to say inexistant!!! I bought a lot of their products, including the VF700, Reserator 1 Plus, fans etc...
I have tried to contact their support center by emails several times, without any answers. Posted in their support forum without any answers too. Many users on their support forum have been reporting this absence of support has well... And not to mention that a couple of weeks ago the support forum went down and has now totally disappeared from their website!
Just thought it was worth mentioning