The best replacement for jerk is nice guy.

The best alternatives to jerk are rated as following:
★★★★★  nice guy
★★★★  push press
★★★★  shuffle
★★★  press
★★★  jerk
★★★  split jerk
★★  narcissist
★★  jolt
★★  push jerk
★★  sociopath
★★  impulse
★★  power jerk
★  krump
★  clean
★  clean and press
★  cajun
★  reject
★  douche
★  military press
★  gentleman
★  stomp
  dougie
  squat jerk
  alpha male
  myoclonic twitch
  reflex
  not a jerk

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Speaking about jerk, one probably shouldn't forget about heart of jerk.

Other search terms related to jerk and their ratings are:
★★★★★ heart of jerk
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jerk
nice guy
push press