I have a D80, 17-135 and Tamrom 200-500. I am thinking of adding a Sigma or Nikon 500 prime (if I can get a used Nikon at the right price) and a Nikon 70-300 (and selling the Tamron). I want to get a second camera so I am not changing lenses all the time. Is it worth spending the extra for a D200 or should I just buy another D80 - I am very pleased with the D80 at the moment.
Another quick question - mirror slap blur - is this a load of horsesh.... or is it something I need to worry about. I read a whole thread on some other forum about how bad the D200 was for mirror slap. I feel I'm missing something important here and feel left out

or should I just ignore it.