The best replacement for 50d is 60d.

The best alternatives to 50d are rated as following:
★★★★★  60d
★★★★  7d
★★★  5d
★★★  d90
★★★  t2i
★★★  40d
★★  t3i
★★  550d
★★  t1i
★  nikon d90
★  t4i
★  70d
★  600d
★  d300
★  5d mark ii
★  1d mark ii
  5d mark i
  xsi
  nikon d300
  canon 60d
  500d
  5d classic
  canon 7d
  1100d
  canon t2i
  5d canon
  30d
  canon 350d
  350d
  7d canon
  canon rebel xsi
  rebel

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Speaking about 50d, one probably shouldn't forget about 24-105.

Other search terms related to 50d and their ratings are:
★★★★★ 24-105
★ 24 105
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