I will add that my Jinhao 750 ($9.50 from Goulet pens) is fantastic. It's my first decent fountain pen, so I have little to compare by, but my father (who is a fan of calligraphy and has had many pens over the years) was impressed by it. It comes with a converter (though not a very good one) and does take standard international cartridges.
I've seen one post so far on these boards about someone whose 750 came apart at the collar a bit, but I haven't had any signs of such behavior out of mine. It's a pen that you won't mind carrying around everywhere, but it looks like it's worth a good deal.