Go with the 120. The 24" front-to-back dimension will pay you so many divedends you can't imagine. The larger your tank breadth, the exponentially more aquascaping possibilities. Very often with 18" or less you tend to get a brick wall of live rock piled up against the back pane. At 24" you can start getting more into a 3d reef, plus have an open area in the back. You could probably get into creating larger grottos and lagoonal subareas. Anyways there are my $0.02 worth...
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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