The best replacement for nook hd+ is kindle fire hdx.

The best alternatives to nook hd+ are rated as following:
★★★★★  kindle fire hdx
★★★  nook hd
★★  nexus 10
★  kindle fire 8.9
★  dell venue 8
★  kindle fire hd 8.9
★  kindle 8.9
★  kindle hdx
  kindle hd 8.9
  kindle fire hdx 8.9

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Speaking about nook hd+, one probably shouldn't forget about n2a card.

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