You can get galaxy s3 in 30k in tiptop condition. Many selling at olx.
Dont go for z3 as i bought and returned within 10mins on 1k loss, as i wasnt impressed with its display, although its 300 ppi on 4.8 inch screen but still its not impressive.
Samsung = Galaxy s3
Huawei = G610 (Below 20k Budget)
Qmobile = A900
LG = Optimus G pro or nexus 4
According to me, these are best mobile phones in mentioned price range. Iam currently using Optimus G pro and loving it 