- 4.2" (800x480) < screen < 5" (1024x600)
- jack 3.5mm
- full USB with host capabilities
- d-pad (can be some kind of trackpoint instead of stylus)
- camera isn't necessary but if there is 2-3Mpx of good quality
- extendable memory (SD better but not necessary)
- hot-swappable battery
- BT
- Wi-Fi
- better processor (possibility to watch movies without rescaling for tablet)
- more RAM for more multitasking
- full access to *unix layer, preferably with normal tools, not BusyBox subset
- starting price $300, which means relatively quick fall to $200 which I am ready to pay