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Ruf for one. See the November issue of Excellence (p. 58) for a review of the 3400K. Claimed 400 hp @ 7000 rpm and 325 lb-ft of torque @ 5500 rpm. For just the supercharged engine alone, 22,500 Euros, but you may want them to add some of their other stuff too; like brakes.
Orton delivered one a couple of months ago. The website still has the old version from 2006 so no new details. The dyno is on cayman club with over 400 rwhp .