Haha, I have the Performer, a SJ I recently acquired from Troy, a crappy Huntington gas grill (which we will be replacing with a Weber next spring if funds allow), and a Weber Q series (not sure which one...about 2007 vintage.
So far have had the Performer going on my own, while wife cooked ABT's on the gas grill. She is a very impatient person, and says she could never cook on charcoal, although she is admitting now that we have a charcoal grill, the food does taste better.
I guess she is right about us not needing more grills, because we theoretically could be cooking on 4 already!
I believe if I could score a blue one fairly cheap, that would be her weakness, as she loves the color blue (she wanted to paint the green performer I just picked up and turn it blue lol).
Interesting topic. I think as long as you have room (we don't), and funds available (we don't), the number of kettles you collect is pretty much up to you.