If money is not a huge object, I would go with the YGE. It is the lightest, and data shows the most efficient. Less heat, less battery consumption, longer life.
If weight is not a huge object, probably the OS/Futaba. All of my experience with OS/Futaba has been great - quality products and perfect support.

I am nervous about Castle, too. I have 2 ICE 80HV controllers and a few years experience with the software. The familiarity is keeping me attached, but I would not have any trouble replacing them with a different brand if I could afford to do so.

I've been thinking about giving them a call and seeing if they can take my equipment and check it out, just to be safe. I know of some failures since the HV2 replacements, but that could be from the bad 4.0 firmware I guess. I don't like not knowing if the new firmware updates that get posted on their site are safe or not.