wide screen is nice but not a must a few games (Quake 4 and UT2K4 ) are some that can take advantage of that , a few things to me that are a must are DVI input, and a resolution of 1280 X 1024 , also you will want to look for one with a good contrast ratio and brightness many look to bright and can't display blacks very well
Depending on your budget, you can get a basic Dell 19" (E193fp, 1280x1024) for as little as $265 on sale; although it has but an analog input, I'm very happy with it, and I can detect no ghosting during gaming.
Also from Dell, you can find a 2001fp (20.1", 1600x1200) for around $503 every couple of months when Dell has a sale; i bought one in early Jan and love it, arrived in 2 days, free shipping!
I don't know what budget you have but I am currently using the Gateway FPD2185W and this is the most amazing monitor i have used yet , it has more inputs then i ever thought i needed PIP, HD ,16Ms responce widescreen 1680 X 1050 resolution , but it has a $599 price tag that goes with it , if you can afford it then this is the best for the money that i have found gateway.com has a nice page with its features, when it came out TG daily did a thing about it and rated it very highly, and yes i did forget to mention a good responce time as that is important.
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