RBK763 and RBK763S - differences?

Thanks. So the number of antennae listed differently on each datasheet is incorrect, then? I have also been considering the 850, but the cost difference is pretty high - although I'm not entirely sure I need two satellites anyway really, which would help reduce cost (in either case)!

Is there not much different in the way of performance between the 760 and 750 series, either? I was just assuming newer=better, ultimately my need is to have solid use of a 500Mbps fibre connection that will be installed next week, in a combination of multiple devices using it at once (some directly using the internet, some using a connected Synology NAS), and with decent range (from house over to garage, for one satellite). This is with all with wireless backhaul. The old RBK23 I'm using isn't bad, but it's definitely going be right up at its limit.