I am in the same boat with the same tank. I ordered the G2 and its still brand new in the sealed box. I am on the fence with returning it for the pro. This will be a frag tank and am thinking that the full spectrum from the pro can provide better results for the frags. In regards to the pro being to powerful, I am thinking that we can just set the intensity lower and should be good to go. That’s one of the benefits of LED's. In regards to the extra $250 being worth it. I have been reading and reading and it seems that reefers are saying yes. That the GHL Mitras and the Radion pros are top of the line and provide the best results.
I will be tagging along on your thread to see if anyone else chime in.