My small, lightweight tripod is a Gitzo 1128 with Really Right Stuff 25mm ballhead, and I've been very pleased with it when I'm not able to use my Gitzo 1348 with RRS 40mm ballhead.
Subtracting the weight of the ballhead from the capacity of the tripod, it will still support 10.5 pounds (4.8 Kg), which has proved to be plenty for my 5D with any lens I own. My heaviest combination is a 300mm f/4 L IS with 1.4x teleconverter on a 5D: 5.1 pounds (2.3 Kg). The tripod with ballhead weighs 3.1 pounds (1.4 Kg), collapses to 21.6 inches (55 cm), and extends up to 57.6 inches (146 cm). If you remove the ballhead for travel it collapses to 19 inches (48 cm).
The newer small Gitzo, the 1157, collapses a wee bit smaller (18.9 inches vs 19) and weighs a bit less (2.3 pounds vs 2.6), but supports a pound less weight (9.9 vs 11) and extends to 2 inches less height (53 inches vs 55). All of these measurements are the tripods only and don't include the head. The slightly lower capacity and weight are insignificant for my needs, but two inches lower at full extension would be a deal-breaker for me since I'm 6 feet tall (185 cm).