Here, I've got it for free because I extended my phone contract.
A friend of mine has got the phone like yours (W810i). When it first came to shops it was around 380$, now it it costs around 250$ or less. (I am not a Vietnamese, however.)
The critics gave iphone a higher grade than n95, but the users did the opposite. I'm gonna read some more to compare the two. Right now, iphone seems to be a winner to me.