In your price range it's hard to go wrong with a nice Spyderco or Benchmade for all around EDC. I'll list a few frame locks from each company that you may enjoy.
Some great EDC Spyderco Knives are:
Spyderco Sage - any variant, I like the 2 and 3 best. - Perfect size for regular EDC, however some prefer something a little larger.
Spyderco Chokwe - Nce long blade, weird looks but very ergonomic, light in the pocket, good steel, ti frame lock and overall just a great EDC.
Spyderco Techno - Small, stout, tough, great steel, nice stonewash, feels awesome in the hand.
Spyderco Para 2 - Timeless Classic, Best of many worlds, GREAT Slicer, Tough Lock, GREAT feel.
Benchmade EDC's:
Benchmade 760 LFTi - Awesome tanto shape, the tanto appears to blend with the rest of the blade as well, coated M4 steel for excellent edge retention, toughness, etc, and shouldn't corrode really with the coating, Ti frame lock, big knife that carries light.
Benchmade 755 MPR - Small and stout but very beefy with m390 super steel.
Benchmade 790 Subrosa - Assisted, but that can be removed. Just a nice looking folder in s30v steel.
If I were given the choices - I'd probably pick either the BM 760 LFTi or Spyderco Chokwe.