Can anyone recommend a stand mixer which makes good pizza dough? I think we've narrowed it down to the KitchenAid 6.9L Artisan Stand Mixer or the Kenwood kMix KMX750 Stand Mixer but there is a huge difference in price! Is the KitchenAid worth it? We will use it for other things I'm sure but our priority is a machine which makes excellent pizza dough.