For now, with my current budget, and with the size of the apartment I'm moving into this month, and the amount of time I have to devote to them, the four I have is my limit (I *was* seriously considering a fifth, but Meeko's $1900 in vet bills this summer put an end to that idea). However, in a few years, once I'm working full time and have a larger budget, and move to a larger apartment, I would definitely like to adopt two more kitties for a total of six (which is the legal limit in my city).