what sports..if its footy the extra reach of the D300s will help..if its soccer or any other games played on a smaller pitch..the D700 is great with the 70-200...basketball is the toughest sport I shoot..the 24-70 does well on the touch line..I used to use the D700..great rig and cheap now..get a low count one owner model and your good to good

mind you even with footy its really only the Tap that's hard to reach...if they are playing the wings they sooner or later come your way..get the D700... that's my pick