Hi,
Not fully knowing your specs, I'm afraid to make a literal product recommendation, but I would highly recommend that once you know what specs/needs you have (PCI/AGP 4x/DVI/etc.) you take a look at the NewEgg web site as a place that will very easily allow you to drill down your options based on a NUMBER of variables, be it price or manufacturer or almost whatever else.
Here is a link for you:
http://www.newegg.com/ProductSort/Su...SubCategory=48
It takes you to the video cards home where you can begin to narrow down your choices.
Even if you don't buy from there, it still is a great tool for helping one see what's out there. I have yet to find a site that offers as good a tool for certain hardware window-shopping (and no, not a bad joke relating to windows

).
Taking a *wild guess*, given you have a 4x AGP capable slot and you don't want to spend too much money but want the possibility of running 2 monitors and want to play games also (of course all of this is asking a lot

) I would say take a look at the eVGA GeForce 6600 for around $100:
http://www.newegg.com/Product/Produc...82E16814130232
Actually, I highly recommend the entire eVGA card line (the nVidia based cards). I've used them for a number of years and they have never failed me. So if you want a recommendation on (at least) a manufacturer and chipset, I'd say take a serious look at eVGA and nVidia.
That's my 2 cents, and I'm sure others will have their own equally valid opinions.
- Raymond