A combo of Gitzo legs and Really Right Stuff BH-55 ballhead will work nicely! If you're shooting with longer, heavier lenses and doing nature photography at some point you'll want a Wimberley or other gimbal head to put on the tripod legs.
The Wimberley gimbal works best with 300mm and larger/longer lenses. The RRS BH-55 ballhead works well with lenses up to and including the 300mm f/2.8, but really is more suited to the shorter, lighter weight lenses.
The 70-200mm f/2.8 VR works fine on the BH-55 ballhead. When ordering the ballhead it is advisable to also order either the L-bracket or plain camera plate for the camera body and lens plates for all footed lenses.
The system I have set up now is quite versatile and flexible. All of my footed lenses have plates and my camera bodies have the L-brackets (which can be used to quickly switch the camera body from portrait to landscape orientation on the tripod). I can quickly set up the Gitzo tripod with the BH-55 ballhead and slip the camera body into position and begin shooting. If I need to use a longer, heavier lens for birding and capturing BIF that's when I pull out the Wimberley gimbal head. I also have a Wimberley C-10 clamp on my Gitzo monopod so that I can easily pop the camera, with or without a long lens, on it and start shooting....
Warning, though: this setup is not inexpensive!
I personally don't care for pan-tilt heads for still photography; they may work fine for digital video photography, as that is the purpose for which they were designed. Probably the best thing to do is to go to a camera shop and experiment with the different setups they have there, see what feels good to you and works for you.
Check out Really Right Stuff at
http://www.reallyrightstuff.com and it will be very useful information for you.