d800 or x-pro1

hello all ... I have a terrible dilemma these days .... and I like to ask your opinion! I'm looking for a back up camera body (I have a d700 at the moment) and I'm very undecided ...

first option: I make an upgrade to the Nikon D800 and i stay in nikon family and i will use my lenses I already have so the d700 became the 2 nd camera body.

second option: Fuji x-pro1, and I enjoy a rangefinder, combined with a pair of fixed lenses like the 35mm and 60mm macros that are already out now, so it would be 2 ° body for various jobs and also for something "lighter to carry around "and the cost is the same +or- of the D800.

what would you do, opinion?? other options?

my main photography is fashion and glamour/nude.

here my website to give u an idea of what i mainly do
http://www.walterfaustini.com

thanks for your reply and please forgive my english, i'm from italy