I don't remember when we bought our first pc, it was probably around 1990 or maybe the late 80's. It was a 386/16 with 2mb of ram that my dad bought at a Computer Show & Sale (a bunch of vendors/dealers collectively renting out a hall of a hotel). We ran all kinds of games on that old beast. Some were edutainment games like Math Blaster and "Super Solvers: Challenge of the Ancient Empires" (we loved us some broderbund in the C64 days which bled into PC) but my brother and I played X-Wing, Wing Commander 2, and I finally got my hands on DOOM...which ran like ass unless you lowered the screen size down real low. By the time Duke Nukem 3d came out, we upgraded it to a 486 DX120 (basically a 486/66 with the clock doubled) and 8mb of ram which we eventually upgraded to 16. I (somehow) got Quake to run on it, but it ran like ass. This computer we kept as our main machine until my sophomore year of high school...
1997:
I don't remember all the specs on it, but it was an HP Pavilion...I want to say it had a Pentium 2, running windows 95, and I eventually got a voodoo 3 2000 to get some real 3d graphics, which let me run all kinds of crazy shit, like Quake 2, Unreal Tournament, Diablo 1 & 2...the works. It was a computer my parents bought but I convinced them to let me use as my own comp in my own room if my grades got good enough. When my grades weren't, I scanned my report card and photoshopped it to look better and lied to my parents. Yeah, that came back to bite me in the ass later, but eventually they trusted me enough to let me have this beast back by the time I went to college.
2001:
I asked for/received a gaming laptop that I specced out to the nines as a graduation present (ended up costing ~$2500). It was a Dell, with a GeForce 2 mobile card, and I think about a half a gig of ram. It was beastly enough in the graphics department that it could beat the desktop I had, but the desktop I had eventually upgraded the ram on so some stuff ran faster there. This computer I only used until....
2003-2004:
My memory runs a little fuzzy at this point, but I think a combination of christmas money and income from a part time job I was working cobbled this badass together. I finally assembled my own rig, and it was a bit of a mess. I got a Radeon 9800XT, an AMD Athlon processor, and as much ram as I could afford, but cheaped out on the power supply, which ended up frying my card a year later. Because I couldn't afford more at that point, instead of getting a proper power supply and another 9800XT, I ended up just getting a 9600 Pro and calling it a day.
2008:
I bought a Gateway P-6830FX gaming laptop because they were running a special deal at Best Buy and shortly thereafter convinced a buddy of mine to get one, too. Great little machine, running a GeForce 8800 GTS and a Core 2 Duo, but there was one main problem with it; the damn thing overheated like a motherfucker. I ended up craigslisting a that same year...
2008:
I picked up an old Dell XPS desktop that someone was selling on craigslist for about $500, and over the next year or so ended up replacing almost everything about it. New case, new power supply, new video card...pretty much all that remained was the CPU/Mobo. This computer served me well, but at this point I was committed to having something able to run any game I threw at it. It was only a couple years...
2010:
This is the rig I have today.
Athlon X6 1055T
8gb Ram (originally 4gb)
GeForce 560ti (originally a GTX260)
Some really dumb decisions went into this rig (more cores = more power! everything will take advantage of six cores, right?) but it's served me well. I'll hold out until maybe a year after PS4 to start the next big gaming rig overhaul. I've replaced the case with something nicer and quieter (Fractal Design R4 case) but I'm waiting until I can justify dropping another 500+ on gaming hardware. I'm married and have a house now, and that sort of expense needs to be justified pretty strongly these days (it was basically work on a new PC or get a PS4).
Man, this post went way longer than I expected, and I rambled quite a bit. Hope you enjoyed my trip down memory lane, as fractured as it was.