First of all,there is no router in the world that can claim "no signal loss". A wifi router's range depends on the environment(design of walls,construction material used,interference from nearby wifi networks etc) it is going to be used in & depending on the environment a 1k router wifi range in one environment can match a 10k router wifi range in another environment.
Within 2k you can only get an entry level AC router & current Tplink Archer C20 750mbps seems like the best option.You also need AC wifi in your devices to utilize AC router advantage so check your laptop/desktop/mobile phone too whether they support 5GHz wifi.For desktop though there is no other option besides getting an AC usb wifi adapter.