ahh, yes, the caliber 5000/pellaton on the portuguese is one of my favorites. i've been eyeing the perpetual calendar myself, too bad it's basically
eyecandy for me until i get out of school. i've seen people selling the portugese for ~$5000-$6000 near mint condition on a few watch forums, you may want
to check those out if you wish to save a grand or two for basically a new watch!
have you also looked into other brands in the same price range? you can get some really beautiful nardins or audemars at that price range (gently used, or
course), i tend to favor the artistry of those over the more conservative iwc's...if i want conservative it'll be a patek for a dress watch and
mid-range for everything else.