Some thoughts on the tripod you asked about- just by looking at the specs:
55" is kinda 'no mans land'. Not tall enough for standing, but a lot more than needed for sitting. So you're carrying un-used weight. You could save close to a pound (and some money) by going with a comparable quality ~44" max height tripod that's plenty tall for sitting on the ground or on a rock, log, etc.
Some like ball heads, some prefer pan heads. Pan heads allow you to be more precise in glassing using the grid method (allows scanning in the X and Y axes independently), and lend themselves better to one-handed use. Someone else can chime in on the benefits of a ball head... not really sure what they are.
The ability to lock the legs at multiple angles is a good trait, although you'll find that option in almost all tripods in your price range. It's not often that you'll have all of the legs set at the same angle in the field.
You're on the right track looking at carbon. Lighter, quieter, stronger.
Beware of 44"+ tripods weighing less than 1.5 lbs (legs only). Technology just isn't there yet to offer a stable foundation and good durability without being over about 1.5 lbs. You have a great scope that deserves a sturdy tripod. Not that the one you're looking at falls into this category, just a rule of thumb while you're shopping.
Don't be afraid to buy legs and head separately. For example you could get SLIK 624 CFL legs and a really good head of your choice for about the same price as the tripod/head combo in your link above. Unfortunately, the SLIK CF tripods gained a little weight when they switched to lever locks instead of twist locks.
Another pretty nice carbon setup that surprisingly hasn't gained a lot of traction yet is Sirui. We got a few of them at the office to check out last year and some of the guys have been using them since with good things to say.
