Hi Priyabrata,
It is difficult to suggest which tablet is good for you.
If you had specified the Specification it would be easy to suggest you one.
I assume that you might be using tablet for you personal use.
I tried to compare various tablets using the specifications. And I found one interesting Tablet for you for Less than the price quoted.
Product Information : Zync Z-999 Plus Tablet
And Here are the Specifications
The Zync Z-999 plus an Android 4.0 ICS-based tablet,
The tablet has a 7-inch LED capacitive touchscreen with a resolution of 800x480 pixels.
The tablet features 3G calling and data connectivity through an onboard SIM slot.
Running Android 4.O operating system, the tablet has both 3G and WiFi capabilities.
Powered by a 1.5 GHz single core ARM Cortex A8 processor,
The Zync Z-999 has 512MB RAM. Weighing 400g, it measures 8mm thick. The tablet has a 2 megapixel rear camera and a front VGA camera.
The tablet is also equipped with a HD video playback support, HDMI support, 8GB iNand memory that is expandable to 32GB, keyboard support function and has an inbuilt 3G SIM card slot.
The table comes with a 4200 mAh Li-ion battery.
The Zync Z-999 plus also comes pre-loaded with apps such as browser, Movie player, IBibo, BBC news and Whatsapp messenger.
For More Information
Look for the Manufacturer Website.
If you are interested and want to buy one then here's the link
http://www.tradus.com/zync-z-999-plus-tablet/p/MOB0000004807162
