I guess if I had only about $50 I'd try to find an honest seller on ebay with a 9800Pro. It'd be used, for sure, but if good it'd be hard to beat for the money. I have used a few FX5200's for very basic systems but I would not spend more than $35-40 on a new one, they're not really that powerful (5200Ultra on Pricewatch is under 40 to your door).
You can have my old 9800pro for $30. Just the card though. I misplaced everything else that came with it (driver CD, etc.). It served me well for about a year and a half, and is still in good working condition. PM me if your interested.
My parents are just looking for a decent video card for their computer if anyone has suggestions please post here.
Anyone recommending a gaming level of card should read the statment in bold, it just seems to suggest he's looking for something that will support good desktop resolutions and Windows GUI refresh time. (Like how crap integrated cards are slow to redraw program windows, things like that.)