I'm building a flatbed 8X10, mostly wood, all possible movements, primarily for landscape work. It will weigh in excess of 10 pounds: with lens and filmholder, possibly closer to 15. I am primarily an out-of-truck shooter: this isn't exactly a luggable camera. I have a good Manifrotto tripod that will handle the weight, but the head's rated 8 pounds. I'm looking for recommendations for a heavier-duty head, pan-tilt, swivel would be nice. Quick plate fairly important. Nothing over $150. Suggestions?