Hi guys, I volunteered to help out my friend to help him take photos for him as he is organizing a 3 day camp for international students visiting my school. Please bear in mind that I am no way professional but just a hobbyist who is still learning and improving on photography techniques. Currently, my camera is the X100. Here's the question, I plan to buy the D600 (when it is released) with a Sigma f1.4 50mm lens. Should I rent a similar setup now if it costs around $250 USD for the 3 days? (D800 + Sigma f1.4 50mm) I think that I might need a good camera for action shots. Is this an acceptable choice? Should I spend $250 to "try" new gear and to help my friend out? Or is my current X100 enough? (I don't think my X100's focusing, speed and accuracy is good enough, but maybe that's technique) Thanks.