The first nib I ever bought was a Hunt 56 and I didn't know anything about nibs. It was a vintage brass nib - which are still available on E-bay. They aren't cheap but the brass/hand ground ones last for such a long time if we remember to care of them properly.
I also love a Zebra G that is very hard to get - It looks like a regular Nikko G nib, except that there is a blue dot on the back side. This dot is ink and it comes off when you wash your nib. Then, the only way to tell it apart from the regular Nikko G is to use it. You will see that it has a medium flex instead of a stiff flex. It was much easier for me than the regular Nikko G. But, you can only get it from Japan or from someone who got them in Japan. I wish there was a way to get more. I even sent an email to Jet Pens telling them about the nib and they seemed excited about the information but I never heard anything back.
Like you said, Erica, the Blanzy 2552 is really nice as well.