Pick the version of eg that most closely matches the version of git you have.
You can determine your git version by running 'git --version'. eg depends on some parts of git that are not guaranteed to remain backward compatible, so newer versions of git may not work with older eg. Every once in a while I depend on some new feature of git as well. However, despite this, it's not that critical that the version match be exact. For example, eg-1.6.5.3 should work fine with git>=1.6.1 and I expect it will work with all git<1.7. It has been used heavily at my $dayjob by git-1.6.2 and git-1.6.3.2 users.