If you are looking for a sleek, compact product I suggest that you check out this new T-P Link product: 3G Mobile Wi-Fi M5350.
About the product: It provides for high speed mobile Wi-Fi. The built-in 3G modem enables you to set up a Wi-Fi hotspot by inserting a 3G SIM card at the back. It operates on a 2000mAh battery which can be recharged with a micro USB cable. It even has a micro SD Card slot, so you can easily put in a micro SD card, plug the device into your PC and voila -it now functions as an external USB memory stick!
As for the cost, it is available at various e-commerce sites with the price ranging from INR4000 to INR4800. There are also various models with more sophisticated wireless features, but would probably be beyond your budget since they have double the price tag.