I think the one of the best wireless router for you to buy within your budget range will be D-Link DSL-2750U Wireless N ADSL2+ 4-Port Wi-Fi Router. This router is available at SnapDeal for Rs.2325 against an MRP of Rs.3140. This wireless modem has universal plug and paly (UPnP) feature for easy installation. The controls available on this router are Factory reset button, WPS button, Wireless on/off switch (optional) and Power on/off switch. In the box, you will get router, power adapter and user manual. The LED indicators on the router will be Power, LAN (1 to 4), WLAN, WPS, USB, DSL and Internet.
D-Link Wi-Fi router will connect a group of users to the internet. So, it allows the multiple use of computers at home or office to share an integrated high-speed ADSL2/2+ interface. You can get a high performance 802.11n wireless access for all the networked computer. There are four built-in Ethernet ports with firewall protection for smooth and secure downloads of several types of files and email over the internet.
The frequency of network is 2.4 GHz to 2.484 GHz. The wireless speed is 300 Mbps. The DSL modem speed is 24 Mbps. The LAN /WAN support is for 10/100/1000. The connectivity is supported by dual 2x2 built-in MIMO antennae. There are 4 LAN ports, I WAN port and 1 USB port. For the purpose of security, there is 64/128 bit WEP, WPA, WPA2, WPS encryption provided and there is a firewall support. The physical dimensions of the wireless router are 33.0 x 116.8 x 162.0 mm (height x width x depth).
The wireless routers' capability of coverage is not known by area in square feet as asked by you. They cover a distance of about up to 40 metres depending on the obstructions caused in the way of waves by which the router performs. 40 meters can cover a big building with number of floors.
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