GJW,
If price is not an issue I would go with a Winchester Model 21. I have several of each of the major classic American guns so I say this with some knowledge. I use a 21 with 28" barrels in 20 bore for all my upland hunting and it is very light and responsive. I doubt anyone would argue with the reliability of the action. I also have a 21 for ducks in 12 bore.
Second choice (even over Parkers) is Fox. An A grade or Sterlingworth are worth their weight in the field.