I think the Manfrotto legs with the horizontal bars are the video supports, defnintely stay away from those.
They can do video but we needed them for our 4x5's and shoot, you could set them up near a tornado and they probably would stay still haha. Plus the quick release legs were wonderful but VERY heavy and overkill if you dont need it.
I use a Manfrotto 190CXPRO4 with a 488RC2 ballhead. It's a great tripod, and it easily supports a gripped body and big white zoom (100-400mm or 70-200mm f/2.8L IS II).
The number on the end of the CX series names is 3 or 4, and refers to the number of sections in the legs. Some will say fewer sections is more stable, but 3- and 4-section tripods have the same weight specification. More sections means a shorter folded length, but also an extra set of sections to extend so setup takes slightly longer.
I would be among the few who say the more sections it is the less stable it is on the heavier gear... Then again the same can be said by extending the center column. The more sections, the taller it potentially can get but only you can gauge how important that is for you. His tripod is a very nice tripod and a hair over $300 on adorama legs only. I would recommend an action grip ball head such as: http://www.adorama.com/BG322RC2.htmlhttp://www.adorama.com/BG3265.html
... They take a little getting used to but once you master them, they are easy to set up and run with. The cheaper one carries less load weight so that is something to consider.
tripods, well feel free to peruse http://www.adorama.com/SearchSite/Default.aspx?searchinfo=carbon%20fiber%20tripod
They are all excellent choices however they each have their own quirks...http://www.adorama.com/BG190CX3.html
... another nice choice with 3 sections... But dont take my word for it.. go to your local store/stores and look at them... hold them... operate them... see what feels best for you given your new knowledge about tripods.