I did a bit of research on this some time back. I prefer a single trigger, but a lot of folks demonize them. I've had no problems with mine.
Of the new guns the CZ is a probably the best bang for the buck. Steer clear of the Weatherby models, as I had terrible luck with them. Watch out for the cheap Russian, Italian, and Spanish guns. A friend of mine has the Smith and Wesson 20 and loves it. If money is no object, the Beretta Silver Hawk is superb.
Keep in mind with older, used guns that most wont accommodate magnum chamberings and chrome lined barrels aren't all that common. Interchangeable chokes would have to be added.