i think the only PCI video cards w/ good 2D quality and DVI out and are widely available will be the ATI all-in-wonder (Radeon) cards...
the g450 might have a DVI out PCI version, but i'm not sure.
oh wait, are u using a regular 15-pin d-sub analog connector??? - if so, then grab a g450 16/32mb or ATI Xpert (if u don't care for 3d too much, or Radeon if u do)...