PCI Video Card Upgrade On And Old Dell 4500S

In the upgrade of an old Dell 4500S for a friend (whose monitor died, so we started from there) I upgraded the 256MB of memory with 2GB, and upgraded the 20GB hard drive with a 60GB version. The old dead monitor was replaced by a Samsung S20B300B 20" 16x9 LCD whose native resolution is 1600x900. However the old onboard Intel i845g GPU graphics chip in the 4500S (82845G) is supported by old drivers that do not have a 1600x900 resolution option. There is one pretty close rectangular resolution available, 1280x768 but it's a bit cartoonish.