For those very familiar with the Wacom Intuos line of graphics tablets: I have had a Wacom Intuos 9x12 tablet (USB) for several years, but never seriously used it until now. I will be using it for everything from photo retouching to digital painting with Photoshop and Painter X on a MBP. I get 1024 levels of sensitivity and pen angle detection now (and a 4D mouse), but I can't use new pens designed for the Intuos3. Are there specific technology or usability advantages the Intuos3 line has over the original Intuos? I could sell mine on eBay and put the money toward a 6x11 Intuos3 (which might be a little less unwieldy), but is it worth it?