They all come with 3 speed fans, not just the illusion, all your paying for with the illusion is the blue lights. And the 300 Illusion still is for sale, not sure what you mean by "there USED to be a 300 illusion".
The Illusion models come with 2 x extra 120mm fans. 2 in the front of the 300 Illusion and 1 front 1 side in the One Illusion. Antec TriCool LED fans are $10-$15 each.
The One Illusion is a new model. There used to just be the 300 Illusion
Helps when you read the whole thing.