Right tablet size for 24-inch screen?

I am looking to buy a Wacom tablet solely for photo retouching and like the price/features of the Bamboo Capture. My worry is that its size (5.8' x 3.6') will be too small. I know for selections where I need to be able to see the whole image at once I probably would not want to zoom in too much. I've also heard that using a small size like 4x6 (rounding up) with a large screen creates some jerkiness.

This website in particular advises against using such a small tablet:

http://gearoracle.com/guides/how-to-choose-wacom-pen-tablet/

Do any of you use a 6x4 tablet with a 24-inch HD (1920x1200) monitor? Should I get a bigger size like the Bamboo Create (8.5' x 5.4') or Intous4 Medium?