Well scored there LCGuy! Getting the machine over 512MB will make a big difference in OS X - but it should still run adequately. And they make great DVD players, especially with those lovely HK speakers.

If you have a subwoofer of some kind, you can run both together - either plug in the sub and then reactivate the speakers in the Sound control panel/prefpane, or gently plug the 3.5mm socket for the sub half way into the headphone socket - you should be able to get signal without switching the speakers off.