How far away was he when he presented the neck shot? 100yards? Man that' s iffy. You could easily blow out his windpipe at that distance and leave him to die an agonizing death. I think you did the right thing. Would you have considered the shot if it was a doe you were after? I don' t think antlers should tempt us into making shots we wouldn' t otherwise make. Your first instinct was the right one. Don' t second guess yourself. (ha, easy for me to say)