Honestly, I think D's betterC would be the right choice for someone that wants to keep writing C but wants modernized features. Go might be great for someone looking to replace C, but betterC is comfortable for someone that prefers to continue to write C.
What I mean is that if you like C99, you will probably like Go. Go can be understood as a modernization of C that doesn't abandon C's simplicity but adds a few important facilities that C lacks.
Go obviously derives from C. It's a very C-like language. It makes sense to view Go as an enhanced C that makes slightly different trade-offs and that is applicable to a slightly different set of purposes.