I think I have reached my cat limit at 2 cats. I don't know how all of you with more than that manage it
Mind you I think Radar is the equivalent of having 5 cats, the amount of energy and mischief he contains.
I am definitely not getting any kittens for a while. I have told my colleagues that if they ever hear me say that I'd like a new kitten to remind me about the dark circles under my eyes and kitten scratches on my arms and face (from Sonic running across me while I'm asleep) that I have at the moment.
But sure if you can afford and have room/time for another then I don't think 8 can be much different than 7, not as noticeable a difference as going from 1 to 2.