I very much agree with what RinkRat posted. When I was looking for a tripod a while ago I read that very same article and thought to myself "naww, I won't need anything that sturdy / expensive, the $300 range for legs and head will work fine" and now a few years later guess what, I am regretting my decision and am thinking that I need both new legs and a new head.
In addition to the Gitzo recommendation (with no center column), I would recommend Really Right Stuff ball heads as well as their L brackets. If you are thinking about renting the 400mm or anything bigger, having a gimbal head is going to be a huge advantage. The gold standard for those types of heads is the Wimberley Head II, which are very expensive, but a more reasonable alternative that was recommended to me was the #3421 gimbal head by Bogen. One of the reasons I'm not renting big glass this year for Red Bull is that I am questioning my tripods abilities to handle it.