The 20.1" wide screens have a height roughly equivilent to that of a 18" 4:3 Monitor (if one existed.) You will lose about an inch of physical height compared to a 19" 4:3.
For gaming its a matter of preference. I like widescreen gaming because it seems more realistic. The monitor fills...
I just picked mine up at CC over the weekend. I used the $40 off $199 that has been circulating to get it for $240 plus tax. I've gotta say this has to be the best budget monitor out there. I've been very pleased so far.
I had a question on scaling of 1080 content on this monitor...