Here's what I toted....
My favorite was a Smith model 638 "bodyguard." Although not truly hammerless, it had a shrouded hammer which made it even more versatile. The gun weighed in at approx 15 oz so my entire carry package (gun, ammo, holster) weighed less than 20 oz.....very comfortable all-day carry.
Weight-wise, I carried a Smith 340SC hammerless scandium which I did not particularly like. It tended to unseat bullets and I had to use 120 gr bullets and up. Recoil with .357 mag loads was fierce, to say the least.
Although I have never owned the following hammerless snubs, I've heard great reports on them.
The Smith 642 is reputed to be about the all-time best hammerless out there, a great compromise between weight and shootability. I have also heard glowing reports about the model 342 scandium. Taurus also makes several hammerless models and I have found the triggers on many current Taurus models to be surprisingly good.
Weight-wise and depending on how you intend to carry it, I'd keep the weight closer to 16 oz, especially if you plan to pocket-carry.
Who sez the snub revolver is dead? There are so many new models out there that you should be deliberate and very careful in your search. Oh well, looking is half the fun.