The best replacement for nano qx is hubsan x4.

The best alternatives to nano qx are rated as following:
★★★★★  hubsan x4
★★★★★  180 qx
★★★★  proto x
★★★  hubsan
★★  mqx
★★  qr 1
★  ladybird
★  1sq

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Speaking about nano qx, one probably shouldn't forget about dx6i.

Other search terms related to nano qx and their ratings are:
★★★★★ dx6i
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nano qx
hubsan x4
180 qx