Mr.RevolverGuy:
1)Your Service/Security-Sixes are definately, georgeous too!
2)I also have a stainless 2.75" Service Six, Security-Six, and the same in an 2.75" heavy barrel, Speed-Six. I didn't have a blue 2.75" Speed-Six-until now, to add to my collection.
3)Keep looking and you will eventually find another Speed-Six to complete your collection. About two years ago, I attended a small local Gun Show-not expecting to find anything. However, as soon as I walked in the door-I couldn't believe my eyes-as there was an NIB 3" stainless Speed-Six-just waiting for me to snatch it up(And, I did!)! So, don't give up the ship too soon! You could very well get lucky-as I did!