Yeah, I am not worried about the couple percent difference. I equate purchasing stocks to refinancing your home for a lower rate. Get your mind committed to a certain number or percentage, lock it in and be comfortable with your decision. If you constantly beat yourself up over a cheaper price, you probably aren't real comfortable with the purchase decision in the first place.
I have been dollar cost averaging, but I also got trapped into buying some of the runs thinking that we will never see those prices again. But, overall I am doing pretty good, .017 average. Little higher than I would like, but I started buying at .026, so in the end I am happy where I stand. I just hope this hits big in my Roth IRA so I don't have to pay taxes on the growth. What a way to stick it to the man if this ends up being a 100x bagger.