Scrod

First off, thank you for having the best selection of quill stems I've seen so far (between Amazon, nashbar, performance, and niagara).

Second, help me understand them better.

I bought this one. In the 180x60x26.0 size.
Here it is on the bike (top pic)

I'd like to get a shorter one, and I keep reading about minimum/maximum insertion levels, and blah blah and I don't have any idea how far down the stem goes into my head tube because I'm a beginner.

I'm looking at the quills on retrogression and I'm hoping you can help me pick one out. I'd like to move up to a 80 for reach, but I'm not sure what length I should be looking at.
I love the cinelli 1A but it's sold out, and it also doesn't say what height it is.
So I'm looking at the Nitto Dynamic 80mm 26.0. Can you help me understand if it's significantly shorter than my current stem?
I'd be happy to do some measuring on my bike when I get home if that's needed.

Or can you suggest others?

Must be silver.

Thanks 'zilla