You should run your own. They aren't lines I'm interested in. GSC although I haven't tried it I have huge doubts it would blow my mind, I'm sure it's good but I'm more interested in the purer sativas ATM, I do know many people are interested however and you want to breed you can't really delay too much as it's time consuming - IBL'ing a polyhybrid even more so. Flavors are nice and all but really I'm after the effect. I don't care about the flavors as much (although I do know terpenes dramatically alter the effects and as such I've found certain more fruity lines tend to be to my liking as well as some of the odder Haze smells and roadkill skunk). I know some people are all about flavor and perhaps GSC is well suited for that.
Personally - I'd take Chocolope probably first and then either OG18 or Cali's Buddah Tahoe next but that's my own preference.