The only DA .22 revolver that I have ever really liked is the S&W Model 63, in a six shot, but you would be lucky to find a good one for $400. Of the DA .22 revolvers I've fired, the S&W was the only one with a decent trigger, in DA mode. I have a Hi-Standard Double-9 from the early '60's and it is a decent quality revolver, but the trigger in DA mode is not good - SA mode is OK. Still, a good one of these might be $300-$400 in todays market, despite the fact that they sold new for about $65 when I was a kid.
The one you handled probably got the firing pin strike lightened too much whenever the hammer was bobbed. Good luck finding parts.