The best replacement for h50 is h70.

The best alternatives to h50 are rated as following:
★★★★★  h70
★★★★  h60
★★★  h100
★★★  h55
★★  hyper 212 plus
★★  h80
★★  coolit eco
★★  212 evo
★★  v8
★  air cooling
★  hyper 212
★  noctua nh-d14
★  a70
★  noctua
★  nikon p80
★  megahalem
★  nh d14
★  v6gt
★  hx1
  hyper 212+
  coolit
  antec 620
  p80
  h20
  nh-d14
  corsair h70
  d14
  canon sx10
  canon s5
  h40
  fz28
  panasonic fz28
  canon sx10is
  dsc h20

Your alternative for h50 is not listed? Suggest!
Speaking about h50, one probably shouldn't forget about push pull.

Other search terms related to h50 and their ratings are:
★★★★★ push pull
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Google Trends

Scale is based on the average worldwide traffic of h50 in all years. Click on graph for more.
h50
h70
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