Well, in this budget, you should seriously consider Nokia 3110c
It has everything you need: FM, Bluetooth, Infrared, EDGE, MP3 player, Card slot & all....
You could get it for Rs.4200 (though it may vary in your area)...
Otherwise, T280& Z310 are okay. They've Bluetooth but no card slot. But I think you don't even need the card slot as K320i lacks it. Else W300i if the way to go.