Posted 09 November 2015 - 06:22
Adding back on this since nearly a year later, I find that I'm still leaning towards the same kind of pen, this time around a Pelikan 1956 400NN, smoother with it's 14K semi-flex EF, tad lighter than the M250 I had, but holds more ink (nearly 2ml vs 1.2ml).
Otherwise the runner up being a slightly smaller Pelikan 140 (also from the 50s), the 14K Broad cursive italic I have on it is also very smooth (though that one was ground to a cursive italic by Vasco of penalusa where I got it from).
Also having a decent Esterbrook J in my hand again, I can say that's definitely on the lightweight, but I haven't come across a nib yet that was smoother/nicer than the ones I mentioned above, but I have a personal preference towards nibs that are a little on the springy/semi-flex side, so the firmness of most of the renew point nibs are not really in my personal preference, though my Aurora Afrika LE with a very firm 18K "M" nib covers lightweight very well, but it also has a sort of hard pencil feedback that just seems to work. So it seems to be a very tricky combination of all of the above that gets my attention, and it's not necessarily just smoothness that does it for me. That and I haven't been actively seeking out the 9xxx series for the Estie (not in the budget currently).