Sorry I'm a bit late in chiming in, but here are my thoughts:
First of all, it's obvious from my signature that I will come down on the side of the GA vs the GS. I have owned dreads, jumbos, GCs, GS, and of course, the GA. With my height and frame (5'6" - 145 lbs), the GA is the right fit for me.
CAUTION: I tried several GS Taylors in the store, and I liked quite a few of them. I even brought one of my guitar straps (I always stand when I play and sing) to test-drive a few of these. They felt quite comfortable, and I barely noticed the size difference. The proof in the pudding for me was taking one home and living with it for a while. The size, combined with the medium gauge strings, became fatiguing for me, and I wasn't having fun playing it. I switched to light gauge strings, but the guitar sounded anemic and still felt too large during my playing sessions. I gave it up for a GC7. I loved that guitar, but it couldn't ultimately stand up to some of my more aggressive strumming tunes, so I gave it up for - you guessed it- another GA!
I have a K24e on order with upgraded koa (my seventh, and hopefully last GA) - I can't wait!
Just my $.02