I would recommend git too. A good read is 'Pro Git' by Scott Chacon (Apress), there is a chapter about importing and especially how to create your own custom importer.
But you can also find a lot of information on the internet, just start at http://git-scm.com/documentation
PS: git is not good at storing a massive amount of really big binary files where each new version changes only a few bytes, as git stores every distinct file completely instead of just a diff to the previous version (strictly speaking to the next version for most vcs).
CORRECTION: git does a garbage collection from time to time (manually you can start it with "git gc") where the individual files are stored as diffs. So the previous paragraph isn't really true anymore (it was in earlier versions)
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