I'm a fan of the 100-150g range. My 215 is just a bit too big. A total pain to get to the bottom of the tank - I get wet.
Of course, Allan, with his alien-length arms, has no problems with big tanks.
That's what bothers me about my 185G. If a frag comes loose or I need to do anything in the tank, I pretty much have to get soaking wet and get a ladder out, etc. A "grabber claw" helps but I still end up with water everywhere.