Jester
[RD Moderator]
2636
My thoughts
As you have already indicated your preference on luminor case and given the price advantage, it's easy to lean toward the 306. Having said that, I would like to state a few counter-points:
-When you're getting into complication like in house tourbillon, I'm not so sure whether historical significance will play such an important role so YOUR preference on the material of choice should play a bigger role
-USD$15k is obviously not small change, especially in the current economical climate. Having said that, it's abt. 15% of the difference in list price. So value for money, I'm not entirely convinced that the 306 is a better buy in a monetary sense
-As Craig pointed out, the heft of a platinum piece is really nice. Have you tried them both?
As Stephen pointed out, buy what pumps up your heart beats and gets your adrenaline running high. Who cares what we say over here? 
PAM 306Ti or 316 Plt
My thoughts