Nw am using nokia x6, i want upgrade it below rs16000, ?

i wl pay 16000rs, i want to stay ful time in online and easy acs social ntwrkng. . . wch s d bst one? Nokia c6-01, c7, wch s d bst cst phone. . . 2000rs m0re for c7 than c6-01,bt wch s d bst cst ph�ne. .