It all depends on how tall you are - and how much you can afford to pay for a tripod. It also depends on in what sort of conditions you'll want to use the tripod. It you want to use it on a seawatch in a howling gale you obviously need a far sturdier tripod.
I'm quite tall, so I need a tall tripod, and the best lightweight tripod I found is the Gitzo 1545T. Here's a technical review:
Gitzo GT1545T Traveler Test Results It's expensive, sure, but pretty good even in windy conditions, and at about 1050 gr (without a head) it is quite light. Maximum load capacitiy is 10 kg according to Gitzo. That's rather optimistic I think. But definitely more than enough for an ATS 65. Combined with a lightweight video head (I use an older Gitzo 2180) I end up at a toal weight of about 1.6 kg. A good video head shouldn't be more than 500 gr.
Hermann