i used to go for the multi-purpose type of gadget (you know, phone+mp3player+video+camera.... +tank) but i realised that nothing can beat one instrument designed to do one thing right.
again, not bashing the iphone or ipad, they're awesome machines (and i used to read on my PC screen for a long time) but, paradoxically, life's much simpler with a dedicated phone, an mp3player, a camera, a recorder, an e-reader.... a tank

they all work marvelously and i get quality from all of them.