Even though i have significantly less experience with various phones, i'm going to go ahad and suggest you to buy the phone i own myself, LG Optimus L9. At 18k you'll get 4.7" screen , 1 GHz TI OMap proccessor, 1 GB RAM ( Shows around 768 MB ) Power SGX 540 GPU ( quite good at this price ), comes with ICS (4.0.4), runs all app smoothly, browsing is almost perfect, New forum alloted at xda forum so you can expect app development to commence soon.
Desire SV is available for around 19k or be less, so at that price it is a very good buy.
One S is nowhere available in white color at 23k, the grey color is available though but it doesn't looks nice.
Or can buy Xperia SL at 23k from tradus.