Depends what you mean by "travelling" though, as these tripods are 1.8 kg without head. Solid little fellows. I think carbon would save 200 grams or so, not much.
Just for accuracy
Carbon version (190cxpro3) 1.29 kg
Aluminum (190xproB) 1.80 kg
All other features are practically identical however. Same load capacity, max height, etc.
Manfrotto has this little tripod and head calculator thing that may interest you if you are trying to decide what to get.
http://www.manfrotto.com/Jahia/site/man ... 82/lang/en
When purchasing my tripod, I read extensive reviews on B&H and Adorama to get an idea on what people's experience with the combos were.
Hardware: Nikon D80, Sigma 10-20mm, Nikon 18-55 mm VR, 55-200 mm VR, 105mm f/2.8D Micro, 35mm f/1.8G, SB-600, Manfrotto/Bogen 190CXPRO3 + 468MGRC2
Software: Aperture, Photomatix, GIMP
My Flickr Page