Cari, I'm about 5"3 and ride the smallest GF Cake, with the saddle quite far back. It's my first full susser and I feel invincible on it. It is very forgiving of poor riding and slippery surfaces.

The key is to test ride in conditions you normally ride in so you have a good comparison. I did find that since I'd never ridden full suss before, all the bikes I tried seemed pretty good. In the end I got the Cake because the price was right (the bogey green colour certianly wasn't! ) and I felt safe on it going down hill - the set up is pretty laid back. It's a bit heavy to pull up hills but I've got lock down forks that help with that, as well as some lightweight components.

Good luck!