Generally you shouldn't buy a stock right after a big jump up - I bought
some geron a while ago (I think about a year ago) aroung 12, and now is the
first time it has been high enough for me to consider selling at all. It was
below 10 during parts of November - I had always resolved to buy a lot when
it dropped below 10, but never got around to placing the order, now I'm
kicking myself.
Another good stock to buy on an extropian theme - Spacedev. This, I think,
is longer term. They offer private space missions (which there is currently
very little market for). I just bought more when they dropped below 1 a few
days ago.