Hi Isapabi,
You're right about the ipad. 64GB isn't sufficient and you cannot insert memory card/ usb stick. You can additionally buy dock connector to improve the memory storage, but that seems hardly practical. For that price you can get a decent netbook. Anyway that's just my opinion
http://www.crunchgear.com/2010/01/27/apple-has-a-solution-for-the-ipads-missing-sd-card-slot-and-usb-port-adapters/