I'm more and more convinced to invest on a Q-20 ball head straight away and compromise on legs i.e. by buying a Manfrotto 055 legs. This set-up should be effective in combination with a D700 + 80-200 mm and allow me to save up for future investments. I really can't afford a Gitzo legs at the moment but I'm still up for improvement on my original task i.e. getting crispy images of the moon!