I think you have to first determine what your needs are. If you plan to make a lot of dough and you want it to be the best it can be without going to commercial equipment, then the Santos unit may fit the bill. To the best of my knowledge, the only members who post regularly who have the Santos unit are Bill/SFNM and David. There are several members who regularly post who have the DLX Electrolux, which seems positioned between the Santos unit and KitchenAid mixers, including scott, Les, varasano and Henrik. All of these members can speak to the virtues of the equipment they use based on their personal experience which, thus far, seems to be very positive. Then there is the high-end KitchenAids stand mixers, such as the Professional series, including those models that have the special dough hook. Based on what I have read from our members, the KitchenAid units, even those at the high end, seem constrained by dough batch size, and will grunt and groan, and sometimes even fail completely, when you try to make large amounts of dough at one time. Other high-priced models, such as the Viking, seem similarly prone to that problem, to the point where at least a few of our members have given up on them.
I have a modest KitchenAid stand mixer and, I too occasionally suffer from the malady of upgrade-itis. But since I rarely make more than one batch of dough at a time, and rarely for more dough than for a 16-inch pizza, the KitchenAid unit I have seems to meet my needs. So, when I get the urge to upgrade, I generally lie down until the feeling goes away. In your case, if your upgrade-itis malady worsens severely, you may want to look into a halfway house to help you overcome the problem and release you back to your kitchen to resume pizza making on your present mixer.