#3 Seth Rollins
There are a load of comparisons between Shawn Michaels and Seth Rollins, not least one that relates to why Michaels may turn on Triple H - neither man is averse to betrayal. Just ask The Shield or Marty Jannetty.
Secondly, maybe more obviously - they're both six foot one and fall in between 215-225 pounds. While HBK is a bit older now, he still looks in great shape, so they'd be pretty evenly matched on the tale of the tape. Add to this both men's dealings with Triple H, and you could even make The Game a special guest referee for some added spice.
Now, on top of all of that, both men are absolute show-stoppers, and arguably both have been the best in the world at one point - and they even have similar move sets. This would be a classic!