Go for widescreen and get the biggest monitor you can afford. Personally, I like 24" because they can handle 1080p resolution.

The 1440x900 is a fine resolution for Vue, however, bigger is always better and some of the Samsung monitors (I have a 22" Samsung 2253 BW) are fairly cheep. I picked mine up for less then $300 Australian. They are probably even cheaper in the States.