Smith & Wesson Model 10:
You can find decent ones from sub-$300 on up. But they can grow on you. You may start out with a police trade-in Model 10-10, then you'll want a standard-barrel one, then one that has a pinned barrel, and maybe a snubbie version or a 3" barreled one for CCW.
Then maybe an earlier M&P or a Victory model, or or.... shazam, you're now a S&W collector!