The best replacement for glock 17 is 19.

The best alternatives to glock 17 are rated as following:
★★★★★  19
★★★  34
★★★  glock 19
★★  22
★★  glock 22
★★  glock 34
★★  21
★  m&p 9
★  beretta 92
★  sig p226
★  23
★  glock 21
★  17c
★  beretta 92fs
★  1911
★  ruger sr9
★  p226
  19 accuracy
  m&p 9mm
  xd9
  beretta
  xdm 9mm
  xdm
  sig 226
  cz 75
  glock 19 accuracy
  xd 9
  walther p99
  springfield xdm
  m&p
  mp9
  beretta px4
  sti gp6

Your alternative for glock 17 is not listed? Suggest!
Speaking about glock 17, one probably shouldn't forget about corner-shot.

Other search terms related to glock 17 and their ratings are:
★★★★★ corner-shot
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glock 17
19
34