Originally posted by: americanswan
The main problem right now is the monitor complains the analog on board graphics doesn't support high enough pixel size for the monitor.
First thing to do is figure out what the onboard video is, using GPU-Z as others suggested.
It is possible your video can support the monitor's native resolution, but that you need a newer driver to do so, or perhaps only to go into the video control panel and move a slider, click an option to set a custom resolution, or something like that.
As for buying new cards, assess whether your system has adequate airflow to use a passively cooled card as many in the low end don't have a fan on the heatsink. However if you aren't gaming the video card temps won't rise much, but some things not so obvious can cause 3D mode and a fair load like screensavers.
Figure out what kind of slot you have, and if a local business you like to shop at has a few alternatives within the desired price range, posting what those choices are (hopefully links to exact model online) might help someone suggest if a minor price difference is worthwhile... since you aren't gaming the desirable options might be heatsink as already mentioned, a newer model looking forward at operating system driver support for as long as possible, better video/movie acceleration, what type and # of outputs in case you ever need a new monitor again or eventually wanted to hook it up to a TV, etc.
If it uses an AGP slot, some of the oldest AGP cards with DVI output used a ADC chip IIRC, which would result in lower quality output. I'm talking about pretty old cards like the Geforce 3 or 4 era, but slightly newer than this could be a bargain if you find someone with a used card to sell, locally a friend, computer shop, or auction... providing it's not so old that limited driver support becomes an issue, we don't know how long you might want to use the card.