I am planning on getting a Pismo on eBay, there's a bunch of them on right now that are mostly the 400MHZ. How hard would it be at some later date to upgrade it to 500? And how expensive? Or should I just get it expecting to leave it as is? Right now I like my trusty Lombard but I'd still like a Pismo if only for the OSX DVD capabilities. And the place to someday put Airport. [] ]'>