I have a Weber Smokey Mountain, a Jenn Air gas grill, and a Memphis Pro that will be delivered today. Once the Pro is up and running the other two are being donated to my son and daughter. I don't see a need for anything but the Pro - hope I'm right.
Currently 3: My old 22.5" Weber kettle, A modified Brinkman Horizontal Offset, and a brand new 22.5" Weber performer kettle the wife got me for Christmas (haven't even used it, been waiting for the weather to be nicer before I pull it out of the garage).
If all goes well... there will be a fourth grill taking up residence in the back yard soon.