My GF 6600 supports a 20" widescreen at it's native resolution. I suggest you look for a GeForce 6200 based card. You can find them online starting at £25 depending on whether you have AGP or PCI-express graphics slot.
'How would I find out which slot, AGP or PCI, I have ?' - Download & run SIW click here / Everest click here. This should tell you your motherboard make & model. Post this info here & someone will let you know what graphics card would be suitable.
Btw, a PCI card would do too - if you have one free PCI slot. So your options could be AGP/PCI/PCI-E depending on your motherboard.
'Any from 6200 would support that resolution would they?' - Yes. Even if they don't updated drivers should take care of it.
Also keep in mind that your motherboard manufacturer & VIA may have released an updated BIOS & display drivers respectively that will be capable of a 1440x900 res. If this is the case, you won't have to purchase a new graphics card. G
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