I hate to say it, but it might be worth more just to keep your system. In the event that M100/Boris comes out with some new system in the future worth buying, if you still own yours, you could get a upgrade price on the new system. Of course that's just speculation, but the way things move in this biz, you never know.
I'm hanging on to my system just for that reason. The $200 you get on ebay, might be worth $1000's if there's an upgrade special for existing owners. Just a thought.