I am considering my first Pelikan. Can I get an opinion on the "Pelikan Souveran M605 Series - Special Edition Marine Blue". Should I get a 600, or better a 400 or 800? Also what Nib size. I am leaning towards a F or M. I have TWISBI M( I like it a lot, but a little wet), Lamy Vista F(I like it), and just bought a Lamy 2000 F(Hate it, as it's to course of a writer. I am returning It). I would appreciate some guidance. Thanks.