Spz has 6 and from seeing his tent I think I want 9. I'm also not necessarily doing auto's. Although I think this with be a part of my next phase. I often end up with 6ft ladies. Unless there is a different combo of lighting to be suggested.
The good thing is you can adjust the lights if you plan to change between autos and photos. 9 would be way to much for autos but would probably do very well with photos.