I own 6 of the Breitling pens.... but I only have a quick and dirty picture of 3 of them at the moment -

In addition to these 3, I also have the blue version in the faux croco case from last year, and the latest orange/black version from this year, plus the yellow/"SA crown" version you mention.
In terms of which I like the most, then the three above are my favourites looks-wise, but the quality of the later one's (the blue, the orange/black, and the black and black/burgundy versions that I don't have) is definitely a little better. For example, the clip on the older versions are just folded metal (like the cheapo old-skool Rolex clasps

), while on the newer ones, they are more solid. However the newer ones are just a bit less interesting to look at. All of them are pretty cool novelties - just don't pay too much for them if you aren't getting them free from your AD.