Difference Flip Mino And Ultra Which Flip Mino Camera Is Better?

Which Flip Mino Camera is better? - difference flip mino and ultra

Which is better?
Flip Mino HD
Flip Mino
Flip Ultra HD
Flip Ultra?

in in this issue, because the point was for the purchase of this camera and I need help deciding, I also like the HD and the latest I saw Flip Mino Flip Mino HD and I like lots of memory so you can get, only up to 60 minutes, but more can anyone tell me the difference in the individual on the list flip minos I?