What's the difference between these 2 Dell monitors?

The big difference is the 20" 2007WFP is not using the cheaper TN (Twisted Nematic) panel. Therefore viewing angle is better. It most likely uses an S-PVA panel on the 2007WFP. The new Ultrsaharp 2009WHP uses the cheaper TN type panel and thefore you see the cheaper price. The view angle is more limited.
 
The 2007WFP is a S-IPS or MVA monitor with far better vertical viewing angles and a standard color gamut.

The 2009WFP is a TN based panel with an extended gamut and poor vertical viewing angles. It is brand new, so no reviews are available on it.

Given the choice I would be much more inclined to get the 2007WFP due to better viewing angles, better color representation, and likely a far higher quality LCD screen in general.

Regards,

10e
 
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