punctuation - What is the proper way to punctuate "but no"?

I'm trying to figure out the proper usage and punctuation of "but no". I think it's one of the following:

• You figure I would have made at least one post about Arthur C. Clarke’s “2010” during 2010. But no, I missed the entire year.


• You figure I would have made at least one post about Arthur C. Clarke’s “2010” during 2010. But, no. I missed the entire year.

Is one of those accurate, or is there a better way?

Answer

Note that you're worrying about the correct placement of a comma in a situation which flouts the grade school rule, "do not begin a sentence with a conjunction like and or but".

What you have here is a casual narrative:

You figure I would have made at least one post about Arthur C. Clarke’s “2010” during 2010. But no. I missed the entire year.

This is not formal writing but prose. An art form. (Is it correct to paint it in watercolor, or should you use oil? Acrylic?)

Hey look, I used "An art form" as a sentence. A fragment! No predicate or anything. Oops, I made like Britney Spears and did it again.