From May till July I will be backpacking from city to city on a weekly basis and am looking for a tripod with fluid head that's relatively small and compact. Since I will be carrying it around with me most of the time, weight is a huge consideration. Right now I'm shooting with a T2i, and my longest is a 70-200 f/4. In the next month I will be adding a follow focus to this, and therefore a small rig. I need to Be able to put a T2i with a small rig and a long lens on it. Be able to carry it with me while travelling by bus and on foot. I would like to Mount a slider on it in the future. Be able to to expand my rig with a monitor and mattebox. Be able to upgrade my camera to a Canon 5D with 70-200 f/2.8 IS. Be able to get it up to eye height. So far, I've mainly been looking at the Sachtler Ace, which looks like a decent choice, but the 4kg weight limit somewhat scares me with regards to any future upgrades to my setup. I understand that you can't have a leightweight tripod which is able to take a lot of weight, but some headroom would be nice. My budget is somewhere around $800. I have read and watched tons of reviews and comparissons, but I could still use some advice. So if anyone has any thoughts or tips I'd love to hear them.