As the 400 f5.6 isn't a particularly big or heavy lens I'd thing you'd be ok with the Velbon that you have, certainly give it a try before slashing out on a new one.
I agree with Andy about the Manfrotto 055, super legs, but personally I prefer the 128 head to the 701. But it's all a matter of choice, if you do get a new one go somewhere and try them out before buying. A good retailer will happily let you try the tripod with your camera and lens combo.
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