Suggest me a good wireless speaker based on my requirements

There are some good quality Bluetooth speakers available at the price range you suggested. Some of the good options can be :

Portronics Pluto POR-131
The speaker is priced a little above your budget range. You can buy it at Rs. 1295. It promises a great sound quality. You have a premium quality of construction for the outer shell. POR 131 comes with expandable memory card option. You also have access to FM Radio which can be considered to be an added advantage. However, it lacks USB port and falls short of your requirements. The speaker assures a good battery backup.

Zebronics BT-035 Spaceship speaker
It comes with a beautiful design that resembles a space ship. The speaker has a crystal structure with rubber grip. The rubber grip can be treated best for the handling comfort. It does support microSD card so that you can expand the memory by another 32 GB. You also have access to an FM tuner. The battery offers a back up of around 3 hours. The Bluetooth speaker can be bought at Rs. 1200.

iBall Lil Bomb 70 Mobile/Tablet Speaker
The speaker offers you USB support. The battery backup on the device is stated to be 5 hours. It comes with a trendy design that suits the modern environment. You can buy the speaker at Ts. 1299.

Philips BT50B/00
A speaker coming from a brand like Philips, yet priced affordably at around Rs. 1000 - this should indeed be a value for money buy. The excellent design is what should one of the best selling points for the device. It comes with USB charging options.

Here are some of the wireless speakers that fits your requirement.

JBL GO Portable Wireless Bluetooth Speaker

JBL products are known for their audio quality. This Bluetooth speaker has both USB and Bluetooth interface. It can easily integrate with Windows, android and Linux based devices. The price also seems to be reasonable. You can find it on Amazon India for 1899 Rs.

URL: http://www.amazon.in/JBL-Portable-Wireless-Bluetooth-Speaker/dp/B00TFGWAA8/

Philips BT50B Wireless Portable Bluetooth Speaker

This cylindrical shaped speaker has a nice voice quality. The device has lot of positive reviews. Also it supports both USB and Bluetooth for connectivity. It charges pretty quickly based on the reviews. The price is also reasonable, you'd find it for the 1299/-Rs on Amazon.

URL : http://www.amazon.in/Philips-BT50B-Wireless-Portable-Bluetooth/dp/B00U2G7IMK/

Artis BT99 Wireless Portable Bluetooth Speaker

Artis seems to be another budget alternative for the wireless speaker. It supports bluetooth and USB. Also it has it's own FM scanner that you can use. Apart from that it has AUX input options. Price wise device seems to be good on many points. You can find it on Amazon for Rs. 1199.

URL : http://www.amazon.in/Artis-Wireless-Portable-Bluetooth-Speaker/dp/B01M1GPZSZ/

Portronics POR-280 Sound Pot Wireless Bluetooth Speaker

This seems to be one of the best selling speaker on Amazon. It has support for the USB and Bluetooth. It has AUX input support. Design is comparatively lot better than the other products of same price range. It is priced at Rs. 1129. You can find the product on Amazon here : http://www.amazon.in/Portronics-POR-280-Wireless-Bluetooth-Speaker/dp/B013T21X42/

These are some of the good options for price range between 1000 to 2000 Rs.