Both my Beretta 92fs Vertec and M84 have a nice DA/SA trigger. The Beretta DA trigger in particular is just the right amount of pull and legnth.
However the best I've had was on the HK USP Elite. The HK Match trigger is light, has a fairly short pull, a very short reset, has an adjustable trigger stop, and is smooth (like butter on glass), and has the cleanest break I've experienced this side of a SAO custom trigger. HK only puts this trigger on a couple models, and that's a shame. It's very good.
Smith & Wesson in general makes a good SA/DA too.