The Allegro is on the large'ish size/width for a speed board. The Allegro is well known here at Sandy Point as Kato used one a lot. Not sure if he ever got 40 knots out of it though?
The other two look like nice small slalom boards.

The problem with using newer sails, especially slalom sails, with the older boards is the mast tracks are too far forward on most of them. This makes them hard to balance and the foot of the sail drags in the water a lot. The Vortex look the best of these three in that respect, and it looks like it has a Tuttle box which will be much better.
It will be interesting to hear your experiences with them. Hope it is fun!