What Makes an Intermediate Pen?

An intermediate pens is a term I've coined to mean, "a step up from the step up." This is a pen that after you've enjoyed the luxury and amazingness that a good pen can provide and you want to go up the proverbial ladder.

I've collected a few pens that I own and a few that I'd like to try below. Hopefully this helps. The lists are in no particular order as in this price range of $50-$150 is really where you can start expressing personal taste.