Punctuation question

[D-Type]

This has come up on another forum. How should this be punctuated?

If you want to walk fast, walk alone. If you want to walk far, walk together.
If you want to walk fast: walk alone. If you want to walk far: walk together.
If you want to walk fast; walk alone: if you want to walk far; walk together.
If you want to walk fast - walk alone. If you want to walk far - walk together.
or?

I've been looking at it too long and I just don't know. What do you think