the bk2 is the older version with a different ratio tranny and some different parts then the cr - said to handle smoother tracks better
the cr is the newest version of the 2wd- said to handle rough tracks better
the xxx-4 is their newest 4wd - said to be better for smooth tracks
the xx-4 is the re released one - said to be better for rough tracks
i havent had experience with any car on that list but the cr. i gathered this information through reading articles and so on.
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Kyosho Lazer zx5
Academy GV2
Team Losi LST2
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