The best replacement for sportster is dyna.

The best alternatives to sportster are rated as following:
★★★★★  dyna
★★★  bonneville
★★★  shadow
★★  softail
★★  starmate
★★  super glide
★★  big twin
★  v rod
★  bolt
★  triumph
★  buell
★  fatboy
★  sportbike
★  street bob
★  fxr
★  triumph bonneville
  vulcan
  honda shadow
  heritage softail
  speedmaster
  streamer
  1200 sportster
  v star
  v-star
  nightster
  bobber
  thruxton
  sirius starmate

Your alternative for sportster is not listed? Suggest!
Speaking about sportster, one probably shouldn't forget about forward controls.

Other search terms related to sportster and their ratings are:
★★★★★ forward controls
★★★★★ wide glide front end
★ vance and hines exhaust
You have in mind a companion for sportster and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sportster in all years. Click on graph for more.
sportster
dyna
bonneville