Agreed! Of the ones you listed here are the King of Pen and M1000. I also have their smaller relatives, the Sailor Pro Gear Demonstrator and a vintage 1980s 14kt nib M800. The KoP was on the lighter side for me (as can be true of Japanese pens). In my opinion, the Sailor Pro Gear is THE ideal sailor (excluding maybe KoPs with the unique nibset). The M1000 is my all time favorite, but it's not as versatile as the Paragon as it's far springier. The M800 is perfect as a day to day writer.
Probably should have mentioned I've been collecting for a long time. Here's the rest of the collection (Excluding a Lamy 2000 and a Montblanc 145 anniversary):
Left to right: Pelikan m1000, m800; Sailor KoP, Pro Gear; Platinum President, 3776 (Flex added); Omas Paragon, Milord; Pilot Vanishing Point matte, 912 FA nib + Flex (not reground smaller though); Nakaya Briar (TT flexible fine nib with elastic finishing), Montegrappa Amerigo Vespucci.
Of these the only pens that see the outdoors are the montblanc 145, pelikan m800, lamy 2000, and pilot vanishing point. I like fountain pens a lot but more for relaxing at home.