In reply to Brumbler:
Suspect your choice/requirements will also determine how mobile you need to be, but I have found compact, light and sturdy to be valuable to me. I spent ages at last year's Photography Show trying out almost every tripod there and there is loads of them at the show! My favourite on the day was the smallest in the Sirui range
http://www.amazon.co.uk/gp/product/B00AZTCHFW?psc=1&redirect=true&ref_=oh_a... but their larger ones seemed equally good. I went with the aluminium alloy as I did not feel the carbon version's 100g saving at double the price at the time was worth it to me.
One year on and I still love mine and it has been lugged up and down hills, spent ages in rivers taking waterfall shots, flown long haul, dealt with many beach shoots and been borrowed and admired by every friend that has a weighty "professional" one. It's a very compact well designed little work horse.
I think for its size it offers exceptional value and I've found the tiny ball head happily holding my Pentax K-R with large, heavy film zoom attached without any creep once stiffened. The tripod legs are sturdy and in very windy conditions I just hook my rucksack to the clip on the center column to add stability with weight and have never had an issue. The legs invert for storage, but it also means with the column extender you can get your camera very close to the ground if required.
Post edited at 23:52