You could go for a S3 Savage4 board like the Diamond Stealth III. Diamond may be on the way out, but you could do far worse for the money. The Savage4 itself is a good chip (not a great one by any means) and would work pretty well in normal office application and internet explorer, and does have a decent turn of speed for the price.
Some people have been able to get cheap Voodoo3's for around $50 with coupon's, rebates, etc. This is a better card for gaming, but would also be perfectly fine for 2D.
In all honesty, the big developments in graphics cards now are in 3D areas. 2D has seen little development over the last few years compared with 3D developments, so pretty much all of todays graphics cards are good for normal office work.