At 8' long, the tank can look pretty long & narrow if you go with 24"H. I increased my depth to 26", and I'm glad that I did. (...but my tank is only 6' long).
At 26", I wouldn't want to go too much deeper because I can't then reach the botom.
My only advice would be to spend 99% of your time planning how to make maintenance easy. Tank depth might be part of that.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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