90+% of Amiga games will work with 512k Chip RAM and 512k FAST. Or 1MB Chip - doesn't matter. You're good to go either way.
I doubt there are any non AGA games that will require more than that, although some games may take advantage.
The 2mb chip ram upgrade was good because it left the trapdoor available, at one point I had 1.5mb there as well (plus 2mb on the expansion slot).
I had a blizzard 14mhz accelerator which plugged into the CPU slot with it's own ram, which stopped the action replay from working :-(
