MSD Coil differences?

OK guys, I need to pick your brains on this one. I am getting ready to buy a new MSD coil to compliment my MSD setup but do not know which one to get. I have exhausted my search options with no luck. I have been looking at the Blaster 2, Blaster 3 and Blaster SS coils. Is there a difference in them other than improvements throughout the years and the coil post mounting on the Blaster 3 and SS coil? For the different post applications, would those require specific wire sets for those specific coils? The other two look like the canister style and the SS seems to be the solid state. Any suggestions? I am a picture guy so here are pics of the three in question. Thanks for the help!