I can't believe we are still arguing carbon vs. aluminum. I would never go back to alum after riding carbon for almost 10 years now. Haven't all of these concerns been disproved by now? CF doesn't explode in the sun, doesn't melt in the rain, can take a crash, has road feel, is stiff as needed, can be shaped any way you'd like, and is still lighter.
My son, who rides an aluminum mtb at school, and rides my old steel custom built Davidson when home, took my rental CF Fuji out while we were on vacation. He's checking out new inexpensive CF bikes now. Once you ride carbon you'll never go back.