Typically you can get the V700 for nearly the same price as the V570 + Ethernet card, as the V700 already has Ethernet built in.
Yes, actually the keyboard and other items under control of firmware (as opposed to the application) are the same number of pixels, but the V700 screen is higher resolution. The higher resolution allows for more detail and sharper images, but there is that (IMO minor) tradeoff that Fernando mentions.