After w810i and Nokia 5800, I am about to buy a new phone. After waiting for a few months, I will buy Samsung Galaxy S II in a few days.
I choose Android phone over iPhone because I like the flexibility of it. Plus the screen is bigger and the update is, hopefully, not long in the future (from Gingerbread to Ice Cream Sandwich).
With long holiday coming up, I will have the time to play around with the phone. Rooting and maybe flashing it with good ROM.