The Ameristep Penthouse is plenty big enough, and reasonably priced. It's big enough for me to shoot a 66" longbow with my son in it with me. I'm 6'2" or 6'3", and my sonis around 5'. That's including two small chairs and he had his bow also. The shoot through netting is great, but it can play tricks on you when the light is low (looks darker than it is from inside).

I got mine on e-bay for less than $200. (I don't remember the actual price, but I don remember it was less than $200, shipped).

Chad