Interesting. What made you move machines on over the last 30 years in general?
I've always worked with PCs so I must have had 15 in the last 10 years, though only changing through as I've changed jobs/found homes for others I've been using etc.
I don't know how many PC's I've had at work over the years. They used to be switched out often. These are all "home" systems I'm talking about. However every computer I've owned has paid for itself -- they aren't just for fun and games.
1. (1979) TRS-80 Model 1 48KB RAM. 2 floppy drives.
2. (1983) Lobo MAX-80, 128KB RAM, bigger floppy drives (8" with 1MB rather than 5" with about 240KB.), 2x CPU speed, CP/M and RS software.
3. (1985) Tandy 1000. PC compatible, 640KB RAM, 20MB HD + floppy drive, color display with crude graphics capability. CP/M emulation software. MS/DOS and would strain at Windows 1.1.
-- toward the end of the 1980's I used a discarded 80386 PC from work --
4. (1990) "White Box" PC in which I went through multiple innards (starting with an 80486 and ending with a Pentium III). First HD was 200MB. I ran Windows 2.1 and 3.0, OS/2, Windows NT 3.51, 4.0, and 2k over the years.
5. (2002) Dell Dimension 8200 512MB. 80GB HD. Tired of dealing with piecemeal systems. Needed more performance for audio processing than computer 4 could handle. Windows XP
6. (2004) Dell Dimension 8300 1GB increased to 2GB. Pentium 4 with Hyperthreading. 120GB SATA HD. Great price and allowed me to use the 8200 as a server, for which it was used until replaced with a Mac mini with SLS this year. Windows XP.
7. (2006) 20" White iMac with C2D processor. 250GB HD. 3GB RAM. Got Parallels and was 100% Mac based for about 5 months. (Laid off from PC and Linux based day job.) I kept the 8300 as a fallback, but I never needed it.
8. (2009) 27" Al iMac with i7 processor, 1TB HD, 8GB RAM. Drooled over the large display (I do lots of photography and some video work). Wanted quad core for maximum performance creating video screen captures demonstrating CAD software running in Windows (under Parallels).
Added -- going from 1 to 8, 4x processors times 8x data path width times 1500x clock speed time over 4x operations per clock = more than 192,000x faster CPU, 167,000x more RAM, 4,170,000x more disk capacity. 3,300,000x network speed (Modem to GB Ethernet). Much bigger display and color. Mouse. Sound. Video capability. Wifi. Color graphics printer. Internet. But computer 1 booted faster!