I have a GeForce FX 5200 which has a DVI and VGA port. I have
successfully configured X.Org with Dualhead however I can't specify
monitor positions (RightOf/LeftOf); The VGA is always set to be LeftOf
the DVI.

Is it possible to achieve this with X.Org's nv driver (I don't want to
use x11/nvidia-driver because it's no longer stable on my system)?

If you require my xorg.conf + Xorg.0.log posted then let me know.

--
Russell Wood