If you want to check out this forum I recently joined because I have started into the hobby
First Build - 55 gallon mixed reef - Reef Central Online Community
that is my tank thread, showing the start up of system.
I agree that the 40B is good, or a 65/75 gallon. Front to back space is important for when you go to do your aquascaping.
Great community over there with lots of information to do it right.
It is an expensive hobby, so it is worth doing it right from the start.
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1.0 Python Regius 0.0.1 Morelia Spilota Mcdowelli 0.1 American Pitbull Terrier 55 Gal saltwater reef - cycling
~Derek
_sic semper evello mortem tyrannis_