The Gan 12 MAGLEV UV Coated is the most expensive 3x3x3 speedcube on speedcubing.org, it comes with some interesting new features including the magnetic levitation to replace springs and giant magnets which on the strongest strength allow the cube to line up perfectly when the cube is misalligned by as much as 30 degrees! Ultimately the cube feels really good but is probably out of the price range for most people. Nevertheless, if you can then buy it here