I'll STRONGLY recommend an RSK Mk1. The real question is whether you want a fullsize or a mini. That all depends on what you want to carry. I myself carry the mini with me all the time. It fits very nicely in my pocket and is plenty big enough to do most of what I need to do. I do own and LIKE the fullsize, but in all honesty it tends to stay inside my daypack on troop campouts/activities, with the mini staying clipped to my pocket.
Both GREAT knives, but my mini gets used 99.99% of the time since it is always there. I like it a lot!!!!!!
Now, about fixed blade knives. I'd had a Buck 119 Special since I a kid (early 70's), but I never like the blade shape or handle finish much. I waited sooo patiently for Doug to come out with the RSK Mk3, I bought one as soon as it came available (I can still picture my wife rolling her eyes), and I almost always carry it in my daypack when on campouts/activities. I REALLY like that knife - great design though a tad expensive. I've had discussions with the Scoutmaster (I'm an Asst. Scoutmaster) and he is (rightly so) just fine with reasonably-sized fixed blade knives. I'm very careful when I use it, and it mostly gets used in the "kitchen", but I like knowing that it is there.
I even bring them along when camping on council properties, but I keep it quite and don't pull them out unless they are being used for kitchen duties - then its no longer a sheath knife, but a kitchen knife in a case. Yeah, I'm not a good role model, but its a reality since our patrol boxes don't have knives in them, and its sooo much easier to clean a fixed blade knife.