The thing is, a 7-10 blade for hard use screams low-alloy steel, especially in your price range. Most knives of that type come with a coating of some sort which means only the edge is bare steel. When the coating wears off, you'll need to oil the blade from time to time, so it isn't really "low maintenance".
The only "hard-use" steel that is somewhat rust-resistant that I can remember right now would be Busses INFI, but its way out of your price range.
For 75$, you'll probably get 1095 or 5160, with 5160 being a little tougher and 1095 holding a better edge.
If you really only have 75, go with Ontario or Becker. They make quality knives that will take a lot of abuse, you will not go wrong with them.
But as others recommended: save up some $ and go for an ESEE. By the time you've upgraded the cheaper knives to the same sheath and handle quality, you're looking at the same price basically. And ESEE still has the best written warranty of those companies.
Not to mention the best heat treatment, great factory sharpness and great fit and finish
In short: ESEE :thumbup: