Kindle 3 3G WiFi or Graphite Kindle DX, which one to buy ?

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I have thinking about this for a while, How could we make sure that Kindle 3 3G or WiFi is not too small to read and Graphite Kindle DX is not too big and too heavy ! I has read Kindle from my IPod touch which has 3,5 inch screen size for a while If I order Kindle 3 3G global wireless it means that the Kindle 3 size is just twice an IPod touch which I think it’s too small. But If I cancel my order and buy Graphite Kindle DX I kind of afraid it’ll be too heavy with 0.5 kilogram. What do you think ? Could any who already own Kindle 2 and Graphite DX help me with this ? I heard that DX is for textbook reading not for carry around, what do you think ?

Graphite Kindle DX hands on video