something to keep in mind -- carbon fiber is delicate -- it is very strong and very light but any damage -- a dent? tiny crack? -- destroys its inherent structure and you could be looking at failure. This gives it a lifespan of distressingly short duration, given the cost.
metal stays strong. You dent it, ding it, it keeps on going. bend it, you bend it back.
bicycle frames made of carbon are very light and very costly, but steel has more flexibility and inherent strength.
Tripods get tossed around a lot -- mine rattles around the back of my car.
i have a bogen with a grip head that is amazing. Added weight also gives added stability to the whole platform. that's why good tripods have a little hook from which to hang a sandbag.