As far as what the running favorites are the :BK2, Mezz PB2, Sledgehammer, Jericho Stinger, X-breaker are among the top 5 best break cues.
Now personally I have hit the BK2 which does get raved about the most and I swear for me it didn't break any better then my J&J break cue with Samsara tip. Actually I found my break was weaker with the BK2. That's just me others will have different results. The BK2 was very nice and very smooth a solid. I just can't justify paying $300 for a cue that doesn't do anything more for me then the $75 cue I got now.
Some custom cue makers probably could build a really nice break cue with heavier woods in the butt and shafts made of heavier or lighter woods (Purple heart or Ash) it's hard to know where to rate those.
Most important of all with the break, if you have a very level stroke, and you can generate as much speed as possible while keeping control of the Cue ball and having it hit flush to the head ball of the rack you'll break just fine with a $5 or $500 cue.