I'm having the toughest decision of upgrading to a secondary camera body for sports. Price also plays an important factor, so I'm relying on this forum to help me make an intelligent decision on what camera body works best for shooting sports. Please provide any details to their Pros & Cons. My next camera must be equipped to handle low light conditions with ease, great and fast AF system, about 6 fps minimum, and sharp and clear images. 
1st Choice: 1D MKIII used
2nd Choice: 7D new
3rd Choice: 50D new
4th Choice: 1D MKIIn Used


