RB760iGS (hEX S) can do close to 900mbit with fasttrack, but that’s about its max and will highly depend on the config.
So i’d say RB4011 is a better choice.
…another option for up to 1gbps speed including NAT, that a fellow user recommend (but I did go for the RB4011 as well for other reasons, so cannot confirm) was the RB450Gx4