I am pretty proud of the fact that I have never owned a "brand-name" computer. Actually that isn't true, my very first computer was a hand-me-down 286 Compaq with a green monochrome monitor. But I had to change out parts on it to get it running. I got that computer in 1995 or so, and slowly upgraded everything in it.
Nearly every computer upgrade I have made has coincided with a new Simcity game. That very first computer allowed me to play Simcity Classic. (which I wanted to play ever since playing the SNES version) I then upgraded to a handme down 486 motherboard and processor. And I was finally able to play Simcity 2000. Which I played on a monitor that had severe burn-in, which was also given to me.
Then I saved up some money, about 300 bucks. And was able to buy a new mobo, processor, memory and a few other parts to really upgrade my machine. I bought an AMD K-6 processor, 266 mhz if I remember correctly. That was back when AMD made much slower processors then Intel, with cruddy floating point performance. But it was good enough for me. And that computer allowed me to play Simcity 3000. I eventually ugraded the videocard, sound card, monitor, etc. Since I was working a part time job during high school.
I used that computer for a long time. Probably 4 years. But eventually I bought a completely new machine. It was an AMD athlon 1.2 ghz, with 512 MB of ram and a geforce 3 video card. It was a great machine at the time. This computer is unique though... it wasn't built to play any simcity game.
I upgraded various parts in that machine over a few years. But due to poor simcity performance I ugraded the big stuff mobo, and processor... mostly to play Simcity 4 better. (which is quite the resource hog of a game... but it's worth it.)
The best computer in terms of speed is the one I currently own, obviously. Also despite the many years of computer use, I only have one distinct time of building a whole new system. So I technically have had only 2 computers. But in each computer I have replaced so many parts, each one didn't have (or doesn't) any original parts in them any more. So can they still be considered the same computer?
But I have many fond memories of the first computer. Saving money to get parts, getting computer parts from other people... when I finally bought the first new processor and motherboard for it was a great time for me. And to be able to finally play Simcity 2000, after years of wanting to play it was probably makes it the best computer I've ever had.