I think my favourite expansions were (in no particular order)
1) My first hard disk. Segate Medallist 1.28Gb slimline IDE. Got that back in late 1994. Totally changed my usage.
2) First accelerator/ram upgrade. Apollo 1240/25 + 16Mb. Got that back in early 1996.
3) BlizzardPPC - got that in 1998 to replace dying (now restored) Apollo. Really wanted the PPC to see what it could do.
4) BVisionPPC - got that in 2000. The difference it made was astonishing :-D
