You should definitely get the High End model. Because PPC's aren't upgradable like a desktop, you can't just open it up and upgrade the motherboard or up the processor or the RAM so whatever you've got under the hood is
IT FOR LIFE, basically. You need something that will be powerful to last you the life of the device. The Low end model is barely hanging in there. In 6 months, it'll be obsolete, IMHO.
Go for the X30
HIGH. Dell is always running sales on it, so just keep your eyes peeled to this website and check Dell's storefront often.
Best of luck! :approve: