I have Mac Minises (4), an iMac (1), a Mac Pro (1), a MBP 15", a Macbook Air 13", an iPad 3, an iPad Mini, an iPhone, an Airport Extreme, an Airport Express, 3 AppleTV, and my old PowerMac G4 MDD in the house at the moment.
Don't know if I will bother with the new Mac Pro. Mine is a couple of years old but I rarely use it as all the other computers are sufficient for most of what I do.