In the holiday gift guide, Dell advertises the 1704 FP as having contrast ratio 500:1 with 25 ms response.  I keep reading though that the 1704 has an 800:1 contrast ratio with a 13 ms response time. 

 

Also, in the ad, they have the 1905fp listed at 25 ms response time, and yet, on their spec page, they have it listed at 20ms response time.

 

Both of these are the ultrasharp models.

 

Any response would be greatly appreciated as I am trying to decide which LCD to bundle with my package. 

 

Thank you in advance,