If it is a new Playing Cue (not break, jump and/or so forth) and their retail pricing is fair, here is what I believe the price range generalizations are (all things created equal):
$0 to $200 = Lower End cues
$200 to $499 = Medium Grade cues
$500 to $799 = Medium to High Grade cues
$800 to $1999 = Higher End cues
$2000 and UP = Collector, Ornamental, and/or Exotic cues
Keep in mind, that these are just guidelines. I mean if a cue has lots of inlays and still poor shaft construction, it can throw this kind of curve off. Also if you have a solid construction cue with little inlays and a great shaft it may sell cheaper than it plays. (And of course cues gotten as a gift that used to cost bundles, are always a welcome invite to any collection. LOL)
It always comes down to how it hits and feels to you, period. Just keep in mind if you haven't played with a variety of cues from all those different levels, it is difficult for you to have a good frame of reference. So ask to hit cues if you someone will let you and start gaining some experience in this.
JMO