At the moment I do own the following computers:
10 Amigas (from 68000@7MHz to 68060@50MHz with PPC604e@200MHz)
2 Apple Powerbook G4 1.5GHz with 1GB RAM
2 Apple PowerMac quad G5 2.5GHz with 4GB RAM
1 HP 9000-217
Some of these machines may be considered oldfashioned. But that doesn't disable you from doing your business effectively. In fact, most of those machines have specialized in an area where they can still coope with the current Wintel-Generation which waste plenty of energy for things the majority of users doesn't need all the time. Some functions which you might have been told to be important as you bought the machine remain even unused.