Considering buying a power meter some time this year, and was wondering what crank based systems would work with Shimano Di2. I have searched around and haven't really been able to find solid information on what is compatible with what. I have looked on the forums using the search but haven't found anything concrete. I am trying not to spend more than $1500 if that is possible, so if anyone has any suggestions, I'd love to here them. If it helps I have a 50/34 and 11/28.