I run (1) 5.5g, (2) 10g, (4) 29g standard, (1) 29g biocube, (1) 45g standard, (1) 55g, (1) 80g, (1) 100g (1) 150g, (2) 40bs....
anyway you are right about the 40b being great but my greatest and favorite reef tank is my 45g and it's an enjoyable challenge trying to position rocks and corals as ideal as possible for the narrow, tall 45g.