I think as a minimum you can target something like a single 1GHz cpu, 16-32 mg video ram, about NVidea GeForce4 or higher, 256mb ram minimum, dedicated graphics card. I think the lowest end iMac had an Intel integrated graphics (which I avoided) and maybe the MacMini has some of that integrated slow stuff too.
These days it seems like new machines are more in the range of 2GHz dual-core CPU's, 512-1gb ram, ATI1600 or higher graphics card, 64-128mb video ram.
I think you can take advantage of the relatively smaller Mac games market in a similar way to how people who are starved for Amiga games go gaga over every game release regarldess of quality - perhaps the limitation makes them a bit more open minded about what they will accept.
These days it seems like new machines are more in the range of 2GHz dual-core CPU's, 512-1gb ram, ATI1600 or higher graphics card, 64-128mb video ram.
I think you can take advantage of the relatively smaller Mac games market in a similar way to how people who are starved for Amiga games go gaga over every game release regarldess of quality - perhaps the limitation makes them a bit more open minded about what they will accept.