For 4000 grand you could get a Quad G5 ($3,300), a copy of Final Cut Express HD ($300), and a Pro Tools M-Box ($400).

You would be set for a long time with that sucker. And if you needed to make it better for around 700 bux you can pick up around 8 GB of ram for it.

In the future you would pick up a copy of After Effects and a copy of DVD Studio Pro and you would be a one man movie making machine. Plus the Graphics card on that mac would be decent for quite some time. Making it plenty good for gaming in the future.