I've decided to upgrade my iBook (500Mz/576M RAM) and trade it in on a Powerbook. My supplier is quoting me $1647.00 difference on a 12.1 inch PB/ 384 RAM with Superdrive or $1947.00 difference for a 15 inch PB/512 RAM with combo drive. Does this seem like a reasonable price to pay, or could I do better? Which model would be better for gaming? (My grandson loves to play games while we tour in the motor home). And I admit I even like to play Tiger Woods golf game to pass the time.