Michael,
Put the 3 tires beside each other (use Tirerack.com as well as they have a few pics of 2 of the 3 tires). You will see the Yoko V4S more aggressive tread pattern as far as wet weather performance is concerned. I personally have not had any experience with the YK520, but I do with the V4S & it's a very quiet tire....as is the Michelin. But I am aware that not only select stores carry the YK520 which I personally think is not a great thing (if they are that good, why does not most tire places carry them, why only discount tire?).
Check tirerack for the Michelin Primacy availability (they should have the V4S in stock as well). Stay clear of that Bridgestone you mentioned......it's still to new to the market & not enough feedback at this point to guage it's overall performance. ;)