I've been trying all kinds of (max) distance drivers lately and always keep coming back to the King.
The thing with the Kings is, like Feldie says, go for the pop tops. I have probably 7-8 Kings and all but 2 are flattish and very flippy. However, the two pop tops are really stable, glidey and long.
We threw some shots with a friend of mine who bags Bosses and my two good Kings were actually more OS than two of the slightly beat Bosses that he bags. He only throws max weight Champions, but from the older not so OS runs.
I max out with the King at around 380' and on a 350' shot they wont even turn. It's quite amazing after reading all the comments online, which on the other hand are in line with my experiences with the flatter Kings.
So give the pop top a go. :thmbup: