My first Mac experience was back in the 90's with of all things an Amiga 4000 computer with a Blizzard 68060 CPU card. The program was Shapeshifter, which was a Mac emulator, which at the time gave me a faster 68k Mac than what was available from apple at the time.
Years went by and I also got into PC's for gaming, but at the time of the clam iBooks, I bought my first proper Mac. Had that for a bit, still playing with my Amiga's and the PC's. Then Mac OS X got released and I got back into the Mac world with a G4 Mac Mini (which a family member still uses). After a while, Apple released the first gen intel Macbook pro's, so I bought a 17" one. in Early 2009 I bought my first iMac.
Now 3 years later, I'm buying my 2nd iMac.
That said, Mac OS X and the iMac is the closest thing to what I think the Amiga would have been if Commodore didn't go bust because of questionable management decisions they made back in the early 90's.
I still use multiple platforms though, such as Windows 7 on my PC gaming rig and I've even got a Linux box doing its thing. Even my 20 year old Amiga 4000 gets turned on every now and then for the yearly nostalgia hit.