1. Budget?
15-20k [Might extend 1-2k more to get a perfect device]
2. Display type and size?
Minimum 4' screen
3. Form Factor? bar, slider, flip?
Bar
4. Preferred choice of brand?
Samsung, HTC, Sony, Motorola
5. Preferred input method (QWERTY, touchscreen, numpad, touch-n-type)...