For a decent games machine i would go for the following spec:
A1200 with Blizzard 1230 MKIV, 64/128mb fast ram, 6Gb+ IDE HD, 4way IDE buffer, PCMCIA Compact flash adapter and perhaps an Indivision 1200AGA.
That is enough to run OS3.9 decently enough too, and if you get a PCMCIA network adapter you could even browse the web though i don't recommend web browsing on anything less than a 68040 with RTG.
