First off you should know a little more about "why" ACD's are more expensive. The number one reason is being the panel type and then 2nd is the aesthetics. All ACD's are IPS monitors. These are top of the line panels that are able to reproduce "true" colors and have little or no distortion at any viewing angle. These panels are made for professional use (for photographers, videographers and graphics intensive applications).
The Dell SX2210 you referred to "looks" decent. But as far as functionality and quality, it is mediocre. It is a TN panel, the cheapeast of panels. Sure it is fine for your "daily" web surfing, word processing, gaming and movie viewing. But it really isn't a workhorse display. Now from the sounds of it, you haven't a clue or don't care about the functionality of the monitor and are just in it for the looks. So be it. But know what you're getting into before you're throw money into it.