New to DG, what Lat 64 driver should I get next and why?

I am loving Lat 64 since I got my River in the mail, love the Gold plastic, the predisctabilty, how true it is to it's flight ratings. 

 

I'm going to get another Lat 64 driver, I want something flippy, with 2 fade.  I'd like around 9-10 speed.  My River is in Gold plastic but if you guys can tell me a bit more about the differences between Gold and Opto I'd appreciated, I'm guessing it's probably close to the difference between star and champion (except you don't have to break in Gold at all, which is very nice).

 

Appreciate any advice you have, thanks in advance.

[David Ledford]

I have a "Flow" Gold and found it to be one of my longest discs.