If you really want a tank, then the ZT200 is the best bet for your price tag. Available in DLC or Satin (Knifeworks Edition), beast of a liner lock, and a great warranty.
The G10 Tyrade is also great, for $75-$85 it's not as hefty as a ZT200 but it's still a pocket tank for an EDC, if I need a knife stronger than my Tyrade, I just grab a fixed blade anyways.
There's also the JYDII composite blade, it's not as much of a tank as the others but it's still a great bang for your buck knife.
There's of course Emersons, I can't stand chisel grinds, I'll never own one but I've heard great things.
Spyderco is reputable but the thumb hole is either a love it, as most people do, or a hate it design. I prefer flippers myself, but that's just my preference.
Let us know what you pick. There's lots of great choices.