I bought SE K750i one month ago, for 9k. It is a very nice piece, for the price. I also got bluetooth headset in the package (without this option price is Rs. 8, 200). 100% value for the money we spend. The software seems to be of most thought out design, which you will realize while using it. Battery backup is excellent. You can charge it through your laptop/desktop by connecting the data cable to USB port. I also own a Nokia 6270, which looks more attractive but you are not satisfied using it, for the price you pay.
SE K750i is a very good one. You will feel happy that you got a good one for the money you paid. Overall it is excellent but I observed the following drawback- The speaker is good while listening to music. But when you activate speaker phone i.e. in a conversation, it is not upto the mark. Discounting the said drawback, I suggest this phone 100%