Yes, as what Hart say; it is just a personal choice.
lets take a car for an example,
you want to drive to work everyday from Jurong to Katong,
you can drive a Cherry, a Subaru, a Lexus, a Porsche or even a Rolls Royce
they all can bring you from point A to point B, but the journey, the experience, the feel, the look, the maintenance, the cost...etc all are different, only you can decide what you want in the end of the day.
Oh boy. You've already named yourself D800. Under normal situations like most of us who don't print more than poster sizes or commercial work, cropped works very well & the body is so much lighter to use. However, you can see the difference when the results are published if you go into details. I was on the verge to tryout MF but then Nikon comes out with a 36mp so let's see how it fares.
end of the day, buy what u like n can afford or something u can justify... must know to use the right tool for the right job..
for out of focus (tempted to say bokeh again.. ;p) , ff sure win crop.. and for prime lens, ff is still best..
for hi iso, the gap is closing...
but for weight and cost, crop win hands down..
sometimes u need to take lens into consideration too.. say for Canon, the 10-22 lens distortion control is better than its FF versions (17-40 and even 16-35 i think).. so sometimes it is not whether u can afford..