It depends on how you can carry the blade (i.e. dress code, preferred position, your own technique/methodology which affects how you want to draw the knife etc..).
That Halloran looks great though it is nearly a 4" blade and it might make it difficult for pocket carry for example but IWB or AIWB carry could be easy with it if 1) you have a covering garment or 2) if you can wrap your tucked in shirt over the knife (to the left or to the right). Also, are doubled edged knives legal where you are?
The difficulty is not really the knife but the sheath. Getting a good sheath (pocket or IWB) is what enables you to carry in an NPE environment, no matter what knife to carry.
For a multipurpose use knife that's factory (as opposed to waiting for a custom blade to be available) and that's small enough to hide but big enough to use, I tend to recommend the Spyderco Street Beat, but the sheath isn't that great. Though I'm sure Orionz06 could hook you up with something that would fit your exact needs.
There is a thread here (that I can't find right now) about pocket carry that has a lot of good info. If you can find it, I think it can answer a lot of questions for you.