Hi all, I am currently looking at getting either a Pilot Custom Heritage 91 or Custom Heritage 912 in with a SFM nib. The only differences that I can see between them are a slight size difference, price difference and differences in the size of the nib - with the CH91 being a slightly smaller Pilot #5 nib and the CH912 being the larger Pilot #10 nib. Would you say that you will be able to feel a differences between the two nibs as a result of their size, and do you think that it would be worth paying the £50 (~$71) for? Thanks a lot! Merlin.