If you are so fed up with them, why not host an internal Git service with gitolite for user access rules [1]. You could even add something like gitweb as a web interface for git/gitolite [2]. Or, better yet, use something like GitLab [3].

[1] http://sysadmincasts.com/episodes/11-internal-git-server-wit...

[2] https://git.wiki.kernel.org/index.php/Gitweb

[3] http://gitlab.org/

We used gerrit at amazon and my current employer and it seems to have plenty of enterprise features out-of-the-box.

https://code.google.com/p/gerrit/

Their enterprise license is pretty comparable in price to something like Perforce, which does not include hosting. Do you also find Atlassian's Stash pricing to be high?

Few things to help diagnose the slow transfer:

* What protocol are you cloning over?

* What connection are you cloning over?

* Where is the connection that you are cloning over?

Why do you rate GitHub's support as "poor"?