If you have the money for a couple new monitors I recommend a site called ebuyer.com
You can pick up a 24inch monitor for £170 in Dollars i think that is roughly $260 - link for this monitor - Samsung SyncMaster P2450H | Ebuyer.com
Or if you didn't want to spend as much as that you could go for a 22inch at roughly £100, about $170? not sure about my currencys lately - BenQ G2220HD 22" TFT Monitor | Ebuyer.com
EDIT: So one of each of these would be ok since you the Samsung supports HDMI and the BenQ Dvi would work well to your GFX card sockets
and ebuyer is also good for a-lot of over products!
Good luck with your desktop!