Yep - Gigabit speeds gives you some pretty fantastic bragging rights. Just go for it, it isn't much more than 100/20 (which is pretty-much what the NBN is).
You'll also note you'll actually be able to achieve this over Ethernet. WiFi is a bit more of a different story but from when I tested the Spark router I got around 600Mbit down, 500Mbit up on my MacBook Pro over WiFi which is pretty impressive.