I'm ready to get into the strobist side of things and have ordered a basic lighting kit. I'm looking at radios now and know that the pocket wizard Plus 2 is popular, but if I've only got one on camera and one on my OCF, why would I not get 1 Plus 2 for the camera and 1 Plus for the OCF to save money? I wouldn't need the OCF PW to re-transmit anything, right? Or is there some other reason the Plus 2 is better to have on the OCF? Thanks!