As far as the trigger is concerned, the best SA trigger on a .357 magnum available today is on a S&W! Of course, they are DA capable, too - so they go 'bang' when you just squeeze them as well. In a dedicated SA - out of the box - the Colt Model P clones - like the Uberti - are quite nice. The Rugers aren't far behind, if you get a good one. A clone of the 1875 Remington, like Uberti's, would be last place - to me. Just uncomfortable, again, to me - too large!
If you can restrict yourself to .38 Special +P max, consider a trade-in S&W model 64, although most are DAO from J&G Sales or Bud's Gun Shop - from $200-$300+. Some also carry model 67's, simply a 64 with an adjustable sight. See what they have that is not DAO, if SA shooting is important to you. the 64/67 family is normally SA or DA - some security guard companies have had them altered to DAO. You can plink away with .38's and protect yourself with +P's - all you need!
Stainz