I'm in the same boat as my aluminum Manfrotto is showing its 11 years of age, one hinge is cracked but still functional, and one leg slips - so working but not as sturdy as I'd like it to be. Broke the quick release handle on my Manfrotto ballhead as well so now it's more of a PITA-release. Both have taken quite a beating at airports and in use, and am very satisfied how it's held up, though.
I wanted something very light and very small so I can fit it in/on a motorcycle saddle bag, and ended up ordering a
Gitzo 1541T with a Markins ballhead specifically designed for that tripod.
Freakishly small at 41cm folded, light at less than 1kg, quick to open with one twist of the wrist, reportedly rock solid. It specs to 8kg load, and from what I've heard it takes a full-sized dSLR with a medium-sized telephoto well. Long telephotos get a bit wobbly due to weight being more off-center - don't own any and don't plan on getting any, so no issue for me. Downsides are very high price and it's not as tall as some of the bigger ones, especially with the center column down.