I am starting to get into wedding photography but I still love to shoot landscapes and portraits as well. I have invested money in my glass and feel I have a great selection of glass; however I have been using them on an D90. I have used the D800 in the past and was impressed on how it performed. But it wasn't mine. After reading site after site and review after review I still can't decide on the 610 or 800. Basically I want to know real concrete reasons on why I should invest in the 800 over the 610? Can someone help me please??!