My main "workhorse" pen is the Lamy Studio. Heavier than the Al-Star, a slightly grippy coating, better balance when "posted" (putting the cap on the end of the pen while writing). Also a bit thicker, which suits my personal preference.
This thread at SA is a pretty good primer for fountain pens and ink: http://forums.somethingawful.com/showthread.php?threadid=324...
I have a few other cheap chinese fountain pens that I mess around with, but mostly stick to my Studio.
Edit: Bonus points to owning a semi-nice fountain pen: you'll never lose a pen again. I religiously keep mine in my pocket because, damnit, I spent a lot of money on this pen! No more losing your 20 cent Bics and frantically trying to find a new writing implement.
Plus inks are fun to buy and experiment with :3