Evasion capped, you will get hit 1/5 times. GH gives 10% counter rate. So 1/10 of those hits you will counter.
That means you will get a counter swing 1/50 times that a monster swings at you (if you're evasion capped).
I don't know how often a monster swings, but I think you'd be looking at less than 0.5% increase in damage from counter hits given 1v1 scenarios.
Even if SS/GH/RR is better in some cases, getting 1% more damage for the loss of auto-reraise would be dumb. For the time(s) where you would benefit from the auto-reraise, it's going to make up for ALL the times you might have had 1% increase in damage.
Personally, I have Apoc/RR/SS as my predefined atmas, so I run with that on every job I play in abyssea.
*edit* I started this post before I read Austar's!