Welcome @spur. Great to start the build already. The aftermarket for JKs is huge and the selection of bumpers could make it tough to pick one. For example check out the bumpers at Extreme Terrain or Quadratec which can range from $300-800. Generally the aftermarket bumpers that are winch-ready will mount the heavy winch lower between the frame rather than on top of the frame. Have fun and post your decision and progress.