I noticed that the git version that I installed from GitHub ( http://windows.github.com/ ) had svn 1.7, but mSysGit 1.8.1.2 still had svn 1.4.
Upon further verification, I noticed that GitHub for Windows does not come with svn! Turns out he was building my version of the svn command line, which I installed on Windows separately.
Removing all svn * files from the mSysGit / bin directory had the same effect. It will pick up any version of svn that you installed on Windows (assuming it is on PATH).
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