Why 6 rounds? If it's a carry gun and you don't get it done with 5 a 6th isn't going to help. Find yourself a S&W J frame variant. Stick with the 38+P - a snub 357 is just unpleasant to shoot and you don't get much additional punch with only a 2" barrel. I have an early 60 and a 642. The 642 is a great hammerless pocket gun. The downside is it's DA only and has a heavy trigger pull. I can shoot my 60 very well at distances using SA. In DA I wouldn't trust hitting anything past 25-30 feet.
The 638 has a shielded hammer which allows SA or DA - this would be my choice if I didn't already have the 642.
A stainless or alloy & stainless is a little more $ but much better than blue steel for carrying.
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