none of the above.
Iphone lacks features most phones support. Has terrible quality control with the app store:
The lg viewty, prada, and samsung are all dumb phones, and i require the ability to install third party apps.
If someone forced me to use a touchscreen phone (touchscreens suck), i would look at the:
blackberry storm (only ts on the market with tactical feedback)
samsung omnia/i900 (runs windows pro 6.1)
htc touch pro (win mobile)
htc touch diamond (win mobile and has a full qwerty keyboard, so you wont feel like chopping your fingers off)
or the nokia 5800 (symbian s60
but if i could wait a couple months, id check out the next nokia n series touchscreen thats coming out.
If youve never used a touchscreen device before, you should before you put up that kind of cash for a phone. They are very difficult to use.