want suggestion to buy tp link router

I second @Zexen. Linksys E5600 is a decent router for the price. If you're willing to spend a bit more you should consider D-Link DIR 1960. Both of them are based on the Mediatek MT7621A chipset, but DIR 1960 is AC1900 and has double the flash/ram. Something to consider if you want to flash OpenWrt. It also has a USB 3.0 for you to use it as a media server. It was around 4k a week back, though the prices have increased now.
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The range and thoroughput depends on the particulars of the building a great deal. If you've multiple concrete walls separating the the router and the clients, WIFI experience would be bad. It would be ideal if you could place the device at a central location. Also make sure the frequency and the channel you use is not used by your neighbours.
 
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