I've also written a fair bit of Go and have recently taken a full dive into Rust [1, 2] and it's been a ton of fun so far. I really love both languages. Their features and goals have a pretty small intersection, but I enjoy both a lot.
If you want to take a dive and are willing to put up with a little instability, now wouldn't be a bad time. The 0.10 release appears to be on the horizon and they just released binary installers, which should make tracking tip much easier: https://mail.mozilla.org/pipermail/rust-dev/2014-March/00922...
[1] - https://github.com/BurntSushi/quickcheck
[2] - https://github.com/BurntSushi/rust-csv