@Odin,
I was always intrigued by that KCS PC board. Was it the best of both worlds at the time?
Anyway, for my A500 upgrades were as follows in order of purchase:
April 1990: Commodore A501 512Kb RAM expansion
June 1990: Mastersound sampler
December 1990: Power Computing double external FDD
February 1991: Philips CM8833 MkII
I bought my A1200 in January 1994 and kept it standard for a few years:
March 1997: Western Digital 420Mb Hdd
May 1998: Apollo 1240 25Mhz, 16Mb RAM
June 1998: Squirrel SCSI with 2x CD ROM
Dec 1999: 4.3Gb Samsung HDD
May 2000: 52x ATAPI CD ROM, 4x buffered IDE interface
June 2000: Eyetech EZKey XS
June 2000: 66Mhz Oscillator ;-)
Sept 2000: Mediator 1200, ViRGE
Oct 2000: Power Tower
Dec 2000: Voodoo 3, 80Mhz oscillator, extra SIMM socket