Thanks guys. Over the next few months my little GX will be doing a lot more highway driving, so a gearbox replacement is non-negotiable. I also lean more toward auto's simply out of experience. My R31's E4N71B deals more than adequately with the 'modified' RB30 strapped to it, and since I've swapped to the E4N, traction, pull-off, changes, and fuel economy(to a minor degree) are tons better. If I can do the same for my GX, I wouldn't hesitate!

So the search begins...

Thank You Gentlemen once again!