I'm not a fan of the Jetta either. Designed for Americans and the suspension settings are different to the GTI

Haven't driven a 159 but its the best looking sedan this side of a Quattroporte. Don't think the resales too great so maybe dont buy a new one? It wont be as nice to drive as a BMW or Audi but the looks and personality compensate. You're not a true car fan if you haven't owned an Alfa (according to Clarkson)