A set of good quality tripod legs is an essential tool in any photographer’s rig. In my opinion, it’s the most important accessory a serious amateur photographer will invest in and one which should be chosen with great care. Good quality tripod legs are not cheap and you can expect to pay between $400 – $800 (USD) depending upon the materials of construction, size and weight.
My favorite set of tripod legs are Gitzo’s GT1541T Traveller. They are made from carbon fiber and are very light-weight (2.1 lbs) but extremely strong and durable. They fold up to only 16″ in length, making them very easy to carry in the field and will support up to 17 lbs of camera and lens, which is just about any lens of 400mm or less with my Canon 40D body.