I agree with Jim right down the line.
My thoughts on the above are:
1. If you can tolerate the 8-12 additional ounces and the slight increase in size, the 3540LS with the M20 is able to damp out about 2X the vibration amplitude that the 2540 is. If you need a good compromise between light and stability then the 2530/40 is the ticket.
2. Buying well at the start is very smart. If you go out and buy all that L glass and then don't use stable support to shoot, you won't get anywhere near the performance the L glass is capable of in terms of resolution.
3. I'm a big proponent of putting a RRS QR lever clamp on any ballhead. It is so much more convenient than the knob types.
4. Invest in a good L bracket/plate. (I like the RRS ones). It really helps make the tripod usage just that much better.
5. I agree with Jim on the weight thing. In fact, I'd go one better - my belief is that tripods get used exponentially less as they weigh over 5lbs.
6. The CF layup and CF content is important. This is what gives you the damping (as well as tube diameter for overall stability). Lots of corners get cut - but the look is great - on those that are trying to knock off Gitzo.
7. I don't think there is any measurable difference between 3 and 4 section legs in the tripods under discussion.
J.