Just to reiterate what I think is the main issue for me...
Ben addressed the point that I am probably most concerned about in this decision:
Frankly, I can't imagine carrying a K-frame gun as much as a J-frame size. All the extra weight and balance for quick recovery time won't do crap when you left the gun at home because it is so heavy that it's a burden.
It's the weight issue that concerns me the most here.
Even more than .357 capability (60) and one more shot (64), it's the weight.
Admittedly, even though I've had good holsters for my handguns, I'm just now getting around to ordering a good gun belt. (A 1.5" Galco is in the mail.) I know that's going to help distribute weight better.
Still, back when I owned a Kahr K9 (23 oz), and had an excellent holster for it (High Noon Topless), I still found its weight distractingly heavy for any length of time. I found myself carrying my little 642 all the time. (I recently sold the K9 to buy my 686, which I reasoned would make a good camp and wilderness gun, but in that case, it doesn't need to be concealed. I'll probably carry it either in a chest holster, or in a shoulder holster.)
But as I've mentioned, the 642 - as fine as it is - just doesn't melt my butter in all cases at all times. So far, I can't hit crap with it beyond about 7 yds (which admittedly is most important, but still). And an extra inch on a barrel will add just bit more oomph to the trajectory of .38 spl, and a few more ounces will help with control.
I made the conscious and long deliberated decision to "get out of semi-autos", and move back to my roots with revolvers. (That's another story entirely, and I won't explore it here.) But I miss that 3" barrel that I gave up with my K9, which, while still very compact for carry, contributed to more accurate shooting. That's what I'm after here.
I'll confess right here and now to having already developed a fondness for the 64
, even though I've not handled one yet (where as I have handled a 60, and liked the way it felt). There's something about the way the 64 looks, not to mention all the good arguments that have been offered so far in its favor.
Yet as appealing as the 64 is, its weight concerns me for the same reason that Ben mentioned above. The 64 is 33 oz; the 60 is only 24 oz (1 oz heavier than the K9 that I didn't like carrying as much, gun belt caveat mentioned again).
Thanks again to all expressing opinions here. As always in THR-assisted gun decisions, I'm learning a lot.
Nem