All tripods are a compromise between weight, rigidity and price. RRS tripods are not available in Australia to try out before buying and it's hard to risk of a grand sight unseen. I upgraded from a Gitzo 2540 to a Gitzo 3541 last week and the new one is way better than the previous. I made this upgrade after shooting a new project over in WA with four colleagues (The South West Project) where we had poor weather. Many of my S2 shots were soft due to wind vibration although there were all perfectly focussed (the rumoured S2 focus issues are totally absent from my shots after 12 months shooting with it).
The Gitzo 3541 seems just fine and it's a lot more robust and rigid than the 2540. It's probably the best one for me given that I can't test the RRS one. However, if you want to get really keen on stability you need to go the route of my friend Les Walkling who uses an old Pentax surveyors tripod with an Arca Cube to support his 200Mb Hasselblad multishot. It's heavy, sure, but it is rock solid - and I mean solid. The legs have been filled with expanding foam to damp vibrations and the top plate has been modified. You can get similar ones from Dutch Hill.
