The Helle range are great for the money so I dont think you will have any problems. Personally I have the Brakar and the Harmoni.
As for sparking a rod, it has nothing to do with the knife or the material its made from, but from the sharpness and hardness of the striker you are using. The Helle knives dont have a particularly sharp spine (unlike Fallkniven that are purposely made at 90 degrees) So, if your heart is set on a Symfoni (May I suggest you look at the Eggen too, it has a nicer sheath, is the same sort of size and usually cheaper) then all you would need to do is flatten the spine of your knife to create a sharp (90 degree) angle. Note, any material be it metal, glass or stone will create sparks from a ferro rod, providing it meets the right criteria (sharp and hard)