would a 1d MIV with moderate wear for $1200 be worth it. BH Photo has one for that price, I have also seen other 1d MIV on other sites in the same ballpark on price. I can not afford a 1dx so I thought this might be an option, I shoot birds in flight and right now I am using an 80d with a Tamzooka 150mm-600mm and have got soome good shots. Is this worth the faster shutter speed but lower megapixels, among other things Any thoughts