What about nokia C2-01.
Its a very good one with 3G and 3.2MP Camera. Its just around 3.8k.
Also look for some Samsung GURU models with dual sim and good battery.
I won't comment on C2-01
but i own samsung metro 3500i bought it for 4.1 k
Look how good it is ( these cons are applicable on almost on all samsung phone under 5k)
1) won't run jar need jad file also
2) won't run file > 500kb
3) poor battery backup even an android phone will put it to shame
4) won't allow installing app on memory card
5) limited memory for installing app
6) Delicate had to replace its ear speaker within 6 months ( Thank God it was in warranty)
7)if u use jar to jad maker it will not accept jad file 90% of all the times u try
8)worst inbuilt browser i have used *( despite i in 3500i for internet)
9)long pressing 0 won't do anything (WTH!!!)
10) will post more once i remember more
OT:-
saswat u should change hdd 500 tb to 500 pb(petabyte)