I am pondering selling off a bunch of low grade pens I don't use anymore, and using the funds to get a Pelikan in Green striated (being vain, the green striated part is what's important). I know the sizes are different (and am sort of indifferent between the two). I used to go for bigger pens, but any more, my lamy 2000 and parker 51s are about perfect. Beyond the size, what are the differences between a 600 and 800? Would love feedback from anyone who has owned both.