I have Gitzo 3541 L carbon 6x mountainer with Gitzo 3780 QR ballhead.
I will never ever have to buy another tripod, this one is for a lifetime (or two)!
It has great stability and durability.
If you have PRO gear, than you need PRO legs too.
Money is always deal breaker, but if you "drive" Ferrari,
than you have to buy extreme tyres.