I bought goban recently, and I've taken an immediate like to it. Trying to learn more, though, since I'm still not good enough to even beat the computer.
Seems to me that the next move would be:
xela: Hello, colinta, welcome to SL!
After black plays in your diagram, white will play as a ko threat somewhere else. If black answers the ko threat, then white, not black, will get to play at . If black doesn't answer the ko threat, then you're right, white will die. So it depends on what happens elsewhere on the board.
Ko fights can be very confusing! I suggest you follow the path Ko Pages - Beginner to learn more--it starts to make sense after you've seen a few examples.