just in case anyone else has the same questions, i was able to find this review online that was beneficial to me... looks like the 200 and therefore i assume the 250 give you the ability to add anton batteries and more importantly, the ability to shoot in 60p... here is that link:
http://www.eventdv.net/Articles/News/Feature/Review-JVC-GY-HD200-ProHD-Camc...