I didnt want to enter this discussion since there are some guys a bit too biased, but I recommend to write your question directly to Bimare.
But:
As I wrote somewhere else here, a Stealth F16 Uni will cost less than the X16, which will be around 13000€ in Germany. In opposition to some wrong comments, Bimare sells the boat including all sails and fittings, and they have a dsitribution network (Germany, Denmark, France and Spain). At least until last year, you could choose between a Spi or the Hooter.
But why having Bimare hulls and a Stealth or whatever rig? There is a lot of hype about the bow shape. Would you think that a Tornado, a Spitfire, a VX 40 (by the way: with hooter), a Mosquito, a Taipan or Tiger are slow and are you thinking that a FX one is faster than other boats? And now have a look at their bow shapes.
So, if the hulls are probably not faster, why not taking a Stealth rig with Stealth hulls?

And just one comment about the hooter. In theory, you can sail it upwind, but you have 1:1 sheet, even if you go to a 2:1 system, in anything than light air, you can't probably use it. In most cases it will not improve your upwind performance (=aspect ratio). But it is though a great sail with easy handling. Sadly, the ISAF rule hampers its development.

Cheers,

Klaus