Re: Looking to upgrade.
I say a three hose maximum and that is only if you think your friends can handle the responsibility of having a hose all to themselves. I have a three hose and will never buy more and would be hard pressed to buy again. I smoke with at least two people most of the time and a one hose treats us just fine. When I had six people at a time the three hose came in handy. Other than that it's not worth it.
Get a Syrian. My favorite hookah is my Nour. I can't recommend MZ or KM hookahs as I have neither. Though I have smoked from a MZ at a lounge and it was nice. Did not blow me away but then again... my everyday pipe is a solid brass nour.