As far as other daggers being more or less impressive, that kind of comes down to both modern and period taste. With more use of organics in the la tene cultures they don't always stand out as much as others might. One of my personal favorite la tene daggers is the one found in the thames with the hilt of small connected rings, it is on display in the British museum so there should be pics of it around. Many of the anthros are just daggers though, even the largers ones would fall somewhere between sword and dagger size. The Iberian daggers can be decorated up pretty fancy and are up there in complexity as far as construction.
I've attached another pic of a couple Hallstatt daggers, one is suppost to be the prince of Hochdorf's. I would assume the gold clad one since his shoes had gold foil. Not sure about the other one though...

