Looking to purchase a tripod that is extremely dependable, strong and lends itself to low-to-the-ground close-up work. The weight for now would be digital slr with fairly heavy lenses since I would like to experiment with the af-s 70-200 f/2.8 and extention tubes. Also would possibly be using medium format some time in future. One tripod that seems to be held in high regard is the Unilock with a ball head. Would appreciate any advice based on first hand experience. Please specify your choice of head as well.