The only thing I would add is to avoid Hoppes #9 oil on nickel guns as it reportedly ruins the nickel.

IMO while the Model 19 has jumped in price it has yet to hit its prime ,
When compared to similar models it is a bargain and many shops still cannot tell a 19-1 from a 19-4.
The OP's bargain price suggests this probably might have occurred .

On the other hand alot of private sellers have doubled the reasonable price of run o the mill versions,
suddenly we are hearing about $800 19-3's a the gunshows.

S&W got it right with the Model 19 ,
Back in the late 50's , 60's and 70's a beat cop wanting some "Magnum" force considering his carry options might realize the well finished tiny little Model 19 featherweight had alot in its favour especially when compared to the other two S&W 357 options,
The minimalistic Model 28 brute or its fancy and pricey Model 27 twin .