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Go with version A, but do a subtle left alignment between the ascender of "d" and the left side of "m" above it.
Version B is too "straight", too "business".
Version C is also good, but A is better.
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Marius Stuparu commented:Yep, this is what I was thinking about. Good luck with your portal.
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Thank you.
We modified the logo a bit following your advice: http://img25.imageshack.us/img25/9152/92216548.png