If you really do want to be able to use the knife to chop and baton effectively, I'd ignore all knives with blade lengths under 6 inches.
The smallest I'd want to go for something like this is a Ranger RD7. They can be had for a reasonable price and are tough, and thick at the spine. You want thick knives if you're going to chop and baton. More weight is more efficient for the former, and thicker spines wedge better for batoning.
If you just want a large knife that can chop and baton should the need arise, but not be built specific to such tasks, something from Bark River, a RAT RC6 or even one of the large knives from the people who make Mora's would work well.
Something along the lines of an RC4 or Mora 2000 would be an absolutely terrible chopper. Don't buy one of these knives to chop with. The balance and mass just isn't geared towards that role at all. These are both great knives that are durable and well made, but they are not choppers.
Some knives to consider would be a Ranger RD9, Ontario RTAK, the larger Beckers, Busse Battle Mistress, Scrapyard Dogfather, Spyderco Forester etc. The longer, thicker bladed knives will work better for hardwood chopping. The thinner knives (RTAK and Forester) will be easier to control when hacking away vegetation and growth to clear a trail or camp site.
When it comes to steel, I've honestly had good results from pretty much everything I've tried. 5160, 1095, 12C27, N69CO, A2, 154CM etc. The main thing to look for considering the uses you have in mind is a steel that will bend, roll and fold over at the edge rather than chip. Steels that behave like that tend to take abuse much better.