At this moment, 260+ views, 13 replies.
There are some trip wire words in the OP's question. A lot of experienced posters are taking a pass on this because of them.
First, "tactical." There's no real definition of that, it's like trying to define "porn." Most of us know it when we see it. In this case, it's mostly just looks - not really any specific feature or special ability, other like some subdued coloration, a non shiny blade, and a tendency to too much aggressive embellishment. That means the knife is likely really meant to make a highly subjective visual representation. How far do we take that? I won't even suggest a brand at this point, it would tip the discussion to far.
Second, "concealed." The concept there is to hide from plain sight, and and that directly leads to Why? A lot of us have no reason to carry a concealed knife, but that doesn't mean we all share that right across the board. Some areas impose ridiculous penalties for it, like the schoolgirl with a SAK in her pack to trim a rosin block for her violin bow.
Without some explicit guidelines why these two conditions are the only ones mentioned in the post, some of us are left wondering what's up? A wide spread of reasons to explain it would actually be insulting on both ends of the spectrum, and we've seen discussions blossom into flame wars in a NY minute.
My advice: It's Just a Knife. Sure, I've run down the garden path looking for the coolest tactical knife I could ever get my hands on, what I discovered is that the entire effort is to have something no one else has, made by a maker who was considered top of the pecking order, yet who never sells to the ignorati or gets copied. It's basically impossible to find that knife - even with a blade made from unobtanium with grips from panels off a spacecraft reputedly recovered from a crash site in New Mexico.
A tactical knife is one that you can carry and no one bothers to think about because it blends into the surroundings. Carrying a Strider fixed blade on a sheath while walking in the Mall would be just about the worst "tactical" application, a Benchmade Risk would be nearly invisible, exposed clip or not. The object fails in being tactical if it's out of place - it's really a matter of fitting into the environment, not being built to overcome it. No knife is ever good enough to do that, it's just a tool for the user to use in normal everyday tasks.
Applying the concept of "tactical" with "concealed," nope. If it's concealed, it could be a bright polished blade with orange G10 grips. Concealed means can't be seen, and at that point, being insignificant if it was observed has no importance.
Sorry for the long rambling post, but that's why the lopsided ratio in views vs replies - no one wants to address the elephant in the room. A concealed knife is problematic in many jurisdictions, and if it's concealed, what it looks like means nothing - you never see it, so what it looks like has no importance.
That leaves the last issue - upgrading to an expensive high alloy steel, which is another subject of competitive viewpoints. A "superior" steel in today's hierarchy is one that doesn't need to be sharpened often, but that is because it's extremely abrasion resistant. That makes it expensive to grind to shape, and hard to resharpen once dull. The constant drive to own a high end steel is really a quest for social enhancement - I've got one, you don't - which doesn't really address whether it's a good steel for someone to carry and use. After all, if it takes two hours to get the edge back, maybe a lesser steel would be a lot easier to carry. I've gone that route, I likely won't ever buy a S30V blade again, just stick to ATS34 or 154CM - at least I can get the edge back in a few minutes time to use that day.
I've seen this question more than once here over the last ten years, it's a nest of complications and meaning, which seems to change with each case. That makes recommendations pretty useless, they become a recitation of "Mine's best!" because they have one.
I'm out of the loop on $100 knives with "better" than VG-10. I don't care for the super steels since they seem to dull just as fast as the "cheap" steels on rough materials, but sharpen a lot slower. Even the lowly VG-10 has given me much trouble with chipping. 
