Share '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 probabl…