Thanks!
Go 120! I struggled mightily between 75/90/120 but the extra depth and height of the 120 allows you to be seriously more creative when aquascaping! I hear from a lot of people that went 75 or 90 very quickly wish they went with the 120. Whatever you decide let me know when you start your build. I would love to see it!
p.s. 120 DOOOOO IIIIT! :deadhorse: