For something smaller that really does disappear in pocket: Kershaw Chive or Scallion, Spyderco Dragonfly, SOG Flash I
If you prefer slim, lightweight knives that are fairly unobtrusive in pocket: Kershaw Leek or Skyline, Spyderco Delica, Buck Vantage, CRKT M16
For something a little larger, but still not terribly cumbersome to carry: Kershaw Blur or Shallot, Spyderco Stretch, SOG Flash II or Aegis, CRKT M21
For a somewhat larger, beefier knife: Kershaw JYD II, Spyderco Endura, Ontario RAT-1
My EDC preference are the second category. The Leek, Skyline, and Delica are some of my favorite EDC knives. I don't know of any Benchmades I would recommend in your price range. The Mini-Griptilian is a great knife too, but it's a ways above your target range.
For the Kershaws, you might also consider looking into
kershawguy's blem offerings. Usually the "blem" is a minor cosmetic issue (mis-printed text, slight discoloration, etc.), but it does come with a healthy discount. You can also look at some higher-end steels (eg. S30V Blur or CPM-D2 composite blade Leek or JYD) on blems that might otherwise be outside your price range.