My favorite writer now is a Dollar 717i. $5 pen and $5 mail form UK. A very nice piston filler with a smooth nib. What else is there to ask for? I have more expensive pens that I do not take to work. But a $5 pen? yep.
I also have a Pilot Varsity I refilled. A $3 disposable. I take it to work too. If someone walks off with it, cheap enuff to replace. As lons as yer happy with how it writes, that's really all that matters. I like some of my cheap pens better than my $100 plus pens.