The first thing that comes to my mind here is explaining the difference between P models and SP models. I know right now I won't be able to answer your question fully, so hopefully someone more knowledgeable (*ahem* Growler perhaps) can answer what I can't.
SP = Sig Pro. These models were developed with polymer frames to make them lighter. The slide, barrel, trigger assembly, and slide rails are all still metal, but the frame and grips and such are polymer. This results in the gun being lighter but also feeling top heavy until you have a loaded mag inserted to balance it out. The P models, like the P226, are fully metal and are not made with a polymer frame.
I have a SP2022 in .40, and it is a great gun. As for the SP2009, I think it is still in production, as well as the SP2340.
Good luck. Sorry I couldn't be of more help.