For survival, I want a big, thick, heavy, full tang, good steel blade that will take a beating.
I say this because I want it to chop well, both for opening a rib cage of an elk, and for constructing a hasty shelter or firewood. (I don't venture into the wild without a firearm capable of taking game if needed.......both for bear/cats and for food.)
I also usually carry at least two fixed blades, for two reasons. First, if I lose or break one I'm not screwed, and second, I can expand the uses by carrying knives suited to different tasks.
For what you are looking for, the cold steel gi tanto (laugh it up....) can be had for cheap and the blade gave knifetests.com a hell of a time trying to break it). Might be ugly, but it would cost next to nothing and is a tanto like you said you preferred.
The sheath is adequate, but I'm going to replace it with a custom kydex sheath after I school myself on that process.
also, I found this, but its a dagger so probably not good for anything but fighting.
midwayusa.com/product/726005/sog-daggert-1-fixed-blade-tactical-knife-565-spear-point-aus-8-stainless-steel-bead-blasted-blade-kraton-handle-black