There are several differences.
Here is a look at the specifications:
As to the prices you listed.....I would say that you have found the Casio Z55 on sale. It's price is usually close to $300.
50% of the people say yes.
50% of the people say no.
Shot to Shot time...
SD400 is 1.5 seconds
Z55 is 2 seconds
Continuous Shooting or Burst mode.
SD400 2.2 shots per second in continuous.
Z55 - does not have continuous or burst mode.
I would recommend both.
I would ask those people that say "wait"....
"Do you promise to make up the difference if it is not cheaper after Christmas."
what is the difference between the two cameras? the casio is $200 while the sd400 is $257
should I get extra 1 or 3 year warranty for either cameras?
how fast do you have to wait in between pictures on both cameras?
Which one would you recommend? I'm buying the camera this weekend and a lot of people told me to wait after christams because it will be even cheaper. Do you think thats true?