The best replacement for hd20 is hd180.

The best alternatives to hd20 are rated as following:
★★★★★  hd180
★★★★  hd23
★★★★  hd66
★★★  hd200x
★★★  epson 8350
★★★  hd65
★★★  pro8200
★★  hd25e
★★  8350
★★  hd80
★  vivitek h1080fd
★  hc4000
★  epson 8100
★  hd70
★  hd33
★  benq w1000
★  gt750e
  hd230x
  ep5920
  optoma hd65
  viewsonic pro8200
  hc3800

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hd20
hd180
hd23