There are a few ways you can do it. First, you can actually get a pretty decent one for $100 after rebate.
First, if you're patient, you can check this thread about once/week. There's nothing particularly good there right now, but that might change over the next few weeks.
http://forums.anandtech.com/messagev...AR_MSGDBTABLE=
The second option is to go here:
http://www.newegg.com/app/ViewProduc...roperty&DEPA=1
The $160-175 monitors are all pretty much good quality. Alot of people are very pleased by the Samsung 955DF. I have a short-depth Viewsonic 19" monitor that works well. I think the E90 is fairly similar to that monitor. The monitors are a little more expensive, but they are also higher quality.