I have the following in my arsenal right now (from strongest to weakest, and "weak" is a relative term because none of these are truly weak): Break S75, Nkryption Code (with polish) and then the Break Pearl.
In box finish, I suspect an N-Code is going to be a very strong ball. But I polished mine with Storm ReactaShine and it's a perfect ball for mediums.
The key is the surface prep, though. Don't buy an N-Code and throw it in box finish and expect it to be much weaker than a Break.
Jess