After figuring all these criteia, your choices should be pretty limited. Then it will only be a matter of testing them out with your equipment.
RICOH GRD I / II / III / IV / GR / GXR
I just bought a Yong Nuo Travel Nomad 5section tripod from James, JLPhoto as a gift for my friend.
It's 5 section, but with my 400D Gripped + 17-40L, it didn't move when pressed down. It's said that if you mount a camera setup on a tripod and you gently poke one leg, the camera will move if it's a bad tripod. It didn't.
Now, I tested the 5 section one. Common sense will tell me that the 4 section will be steadier, and the 3 section will be steadier than the 4 and 5 section ones due to the larger last section leg.
I love the twist locks because it's a lot better when packing, especially for people like me who put the tripod on backpacks.
I highly recommend either of their 3 tripods. When the stock comes for the 4 section YL 580 (it's globally out of stock for a few months), I will definitely be getting it. I'll shell out for the Gitzo CF and RRS heads next time when I save up enough, but the YongNuo tripods will definitely serve me well.
S$99 for 4section and S$110 for 3 section is a steal. I won't tell how much I bought the 5section one for.