I have had a couple of Sailor 1911s, one with a regular 14K nib and one with a Naginata nib. They are very good writers. I'm not such a fan of using a cartridge converter though, so I may get a Realo at some point (the piston fill version). Japan must be a good place to buy them and I bet you can find a reasonable price if you hunt around. My favourite pen for work right now is a Pelikan 600 series, a dark blue piston filler with a medium nib. I very rarely hear of people being unhappy with Pelikans. If you can get a good deal on one it's certainly worth looking at to see if you like the way it writes. That Conway Stewart lever fill looks exactly like one I have, which was owned by my grandfather. They are lovely pens, although the nib on mine is getting a little scratchy after having given faithful service over the years.