I agree with you about the Speed Six. I had a blue 4" Service Six I gave to my son. The Security Six has a better looking profile however with the adjustable sights. I would have taken a Speed Six but had to settle for the Security Six.I like the Security six better than the GP100 or teh SP101. both Those guns are oversized for their capacity (the 7 shot GP makes more sense and the SP is too big for a 5 shot) but the security six was just right and it was still a stronger gun than the K-frame smith.
The 2 3/4" fixed sight Speed-six was the best 357 snubby made, but I also like the Kahr K-6. It's about the size of an SP-101 but holds six shots. It's also a better defensive gun than an Airweight S&W J-frame for more controllable repeat shots due to the added weight.