Ideally I would suggest a Gitzo GM2541 - simply because I own one and know what it can do!
Whilst it is fully up to supporting any EOS lens that Canon currently make (I used mine with a 600 F4 L IS and 800 F5.6 L IS) it does look like a matchstick hanging off the lens!
For your setup the GM2541 would, in my opinion, be the best available - but not cheap! Also have a look at the Sirui P224 and P324 - very nice Carbon Fiber mono pods at more sensible money. I have the P424 and it is a great piece of kit and almost (but not quite) up to Gitzo standards.
The Sirui's are well made and perform well - the Gitzo models are just better but more expensive!