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ones I'm eyeing up are 1.4mm. I'll probably end up with whatever is cheapest that I can get in town, but in the meantime I can procrastinate moreThe Kuru-Toga pencil is good - it's quite cheap and also has a system which revolves the lead every time you press on the paper, so it doesn't wear down on one side. It even has a little window so you can see it revolving.
Otherwise I use clutch pencils personally, which have fat 2mm leads that don't break and are way easier to change.