Hi folks,

sugest me an mid - range android smartphones?

i want atleast 4inch display,1ghz processor etc

Buy Samsung Galaxy core or you can also buy Sony Xperia M if you are looking for some reputable brand, other than that there are lots of Domestic brands too. Xperia M is really awesome with latest hardware and 1GB RAM , Adreno 305 GPU .. really beats competition. And if dual sim then you can buy galaxy core, it is but running old hardware yet good for day to day usage of your smartphone. Both cost around Rs.13000

Top brands amongst market today are Samsung, Sony....according to your budget & need. Out of which Samsung is largest selling brand today & have captured great market amongst smartphones.
Samsung Galaxy S duos is an great option for you.
Other than, I would say another option, Lenovo P770, is best option for you other than Samsung.