It is pricey, but I chose the 340PD, and would do it again. The thing is crazy light! Yes, it kicks like a mule with 357Mag, but none of these are pleasant range guns with strong loads.
At 11.4oz, it is just so easy to put in a pocket, has great sights, and serves its purpose.
Going up from the 11.4oz, the LCR and M&P340 are both in the 13oz range. Next step up in weight is the 442/642-like models at ~15oz.
For pocket carry, I like light, and the 340PD is very tough to match in that regard! I'd say at least look at the 340PD if your budget allows.