There is a virtualbox package in the main repository for 2009.2, which I have installed but:
That is correct, but the repository version does not have all the support that the Wiki version
The Wiki version will automatically show a screen to mount an iso file at first start when no OS is detected inside VirtualBox.
Otherwise you can add an iso file in Settings > Storage (translated from Dutch).
[As for the Nvidia drivers and the FX5200, as I recall the proprietary driver works at 1680x1050 over VGA but not DVI,
With my card I don't have this problem.
...... and the VGA quality on that monitor is significantly less crisp than the DVI.
That is correct as you do not have a digital>analog converter in the DVI output and a analog<digital converter in the monitor..