A better bet would be one of the G4 Power Macs. Bigger and noisier but they will run OS9 natively.
Agreed on this-I've never been particularly hot on classic mode, especially on single processor systems. I much prefer to run OS 9 natively.
My main "gaming machine" for Classic games is a Cube with an 800mhz/1mb Sonnet upgrade, a GEForce 3, and connected to an ADC CRT. I will fully admit to this not exactly being a common set-up. The Sonnet was generously given to me by @jbarley
, and @LightBulbFun
found the GEForce 3 for sale. The ADC CRTs are best hunted down locally due to their size and weight. I prefer a CRT in this application because they run a lot more gracefully at less than native resolution, something that becomes significant when you have full screen games at 800x600 or 640x480.
For "on the go" I alternate between a Clamshell iBook and a 1ghz TiBook. The Clamshell again provides an advantage for full screen, as there is minimal "windowing" when running a 640x480 program on its 800x600 display.
I have a 9600/200MP set up also for some really old stuff that just runs too fast on a G3 or G4. Granted, I've found some stuff that still runs too fast on that. The 9600 is parked next to my main Quicksilver, and I have a handful of sort of "mindless" games I play on it to pass the time while I'm waiting on the QS to do other stuff. One particular one is a 1992 version of the card game Mille Bornes(my second favorite card game behind Rook). The computer's plays are effectively instantaneous, and it's caught me off guard more than once.