I got the imaginarium (Petco brand) stand for my 40b free from a friend. Not my first choice, but free is free.
It's, I think, 29.5" tall, which I like, because it is easier for my kids to see. But I had to make some serious measurements to get a skimmer under it. Because of the lower shelf height, I automatically lost 3-4 inches. Then I need space to remove the cup, so that's my hand width (small presidential hands) and the room necessary to take it off. I got a 18" tall skimmer, but alot of older models would only just fit, if at all.
Just something to think about. Height of the tank isn't the only consideration.