i'm posting from work, and we all use G3s and G4s, mostly iMacs, but next door in our storeroom we have a multitude of macs through the ages, including a Macintosh IIcx, a Macintosh LC and a Macintosh SE/30, not to mention a good few different flavours of PowerPCs too (Quadras and so on).
I know it doesn't really count, because they're not even mine, and i'm not even using them, but they are very cool and retro et c, and they are selling them all off soon (or dumping them i suspect) so i am toying with the idea of getting one of their old macs. it might not be worth my while though, you know, i'm of two minds....