I'm not very knowledgeable on the subject, but i would suggest reading up a LOT before buying.
Around 16 months ago i purchased 2 x Samsung 205BW. Lovely looking, especially as a pair. I went for the cheap option (£200 per monitor) at the time and this was a bad idea. I should have gone for the Dell Ultrasharp, it had better reviews, and since I have now SEEN it, I can confirm a much better picture.
Firstly the colors were inconsistent between the two screens which immediately indicated a lack of quality. The viewing angle is quite appalling, depending on the height of my chair, I sometimes get some pinkish white gradient on plain white (eg. websites).
Definitely put the money in for an ultrasharp, ACD or higher end samsung as they are worth it, especially if you use them as much as I do mine. If its a case of $50/$100 then save another few weeks and get what you really want.