I would recommend a Gitzo Mountaineer series, the 2541 seems really nice. I use a 3531 which sacrifices a little bit of size and weight to be more sturdy, but it's extremely sturdy, and I wonder if the 2531 would've been enough. The xx41 models fold up a bit smaller, and I think for situations of critical strength, there wouldn't be any sacrifice for having 4 leg sections, as they would likely be collapsed anyway. I would strongly recommend against the Explorer series. I ordered a 2531EX and immediately sent it back due to weakness and flexibility where the center column attaches to the legs. The 3531 Mountaineer is just an impressive piece of engineering though, worth every penny.
I ended up with a Markins Q10 head, which I have no complaints with, absolutely top notch just like the Gitzo. I think if you wanted to shave some weight, the Q3 would still be well over spec'd for the body/lens you mentioned. I went with the 10 because there was a minimal price difference, and I wanted to be future safe, if I ever got into longer tele. The Q10 is a fair bit heavier than the Q3 though. I went with Markin's because they have one of the best weight/capacity ratios. Really right stuff seems to be a bit more concerned with ergonomics at the cost of weight, but came equally highly recommended. I actually ended up getting my quick release plate from them, as markins didn't have an l-plate for the 60D.