dvn- For a while there, the prices for a gen 16520 were starting at around $11k - $12k and up to around the $50k - even the $80k range depending on the flavor of dial/metal variation/rarity (i.e. porcelan, floating, patrizzi, A/P serials etc). These days, prices have come down a bit, but I think full package rare examples still pull in a fair figure; standard models not quite so much.
As for dial choice- White is definitely a little more formal, with black being a little more sporty (in my opinion). Both are quite versatile...