I've been looking at this as well. I'm currently running my gigabit fiber connection through a GPON-ethernet media converter and from there over Cat 6 to a ubiquiti Edgerouter-X. It does okay with hardware offloading enabled for things like ipsec and NAT, but it's taxing the CPU and I'd like to move to something with a little more headroom.
Got any recommendations for something that can route beyond gigabit, when NATing and DPIing and other things?