Forget the ACA's, if you want to do gaming and want your A1200 to be stable, get yourself a Blizzard 1230 with 16 or 32 MB ram, more than enough and FTW
As for display, like said above, get yourself a 1084, the new type, far less expensive than any monitor combined with an Indi.
Add that harddrive you got and you got yourself a kickass system.
