I feel compelled to mention that while Frenzied Berserker and Eternal Blade are both, individually, good classes, they really don't mesh all that well in Gestalt. You'll be lacking both Reflex and Will saves and have really lousy skill selection. Plus, the requirement of Int added to an FB is just silly, since you already need Strength, Constitution, and even a decent Wisdom in order to get your +18 Will save modifier (an absolute necessity when it comes to playing FB's).
If you want to go Eternal Blade on one side, consider adding Wizard/Swiftblade on the other. If your first gestalt level is at 6, then something like...
Warblade 5 -> Warblade 3/Ronin 2/Eternal Blade 10 || Wizard 5/Swiftblade 10
On the other hand, if Frenzied Berserker is more your thing, then where you go with it depends on what, exactly, you're looking to do.