My ten cents...
Just try to install everything using the generic SVGA driver XF86_SVGA, it should work ok
and give you at least 640*480 256 colors....if it doesn't there might be something wrong
with you card...
Have you tried looking at some linux newsgroups to see if anybody has had the same problem??
Now, if it works with the SVGA driver, then its for certain a driver selection problem,
if you copied the driver file into the right place, try to edit the XF86Setup and
check everything mannually, also don't forget the "X" link in /etc/X11 directory this
link "MUST" point to the right driver...
good luck...