Best ballhead w/ QR for super-telephoto zoom?

I'm not new to photography but I'm new to the "extras" - external lighting, tripods, etc. Trying to piece together a hiking-friendly tripod kit that will support a lot of heft and won't drain my bank account. Have decided on a Gitzo set of legs, and have decided I'd like a ballhead, but which?

I'll be using a D700 w/ the battery grip and the Nikkor 80-200mm and Tamron 200-500mm.

Added (1). No thanks troll, I don't visit sites I don't trust, especially not from a new-today user.

You might like this one

Manfrotto 498RC2 Ball Head with Quick Release Replaces Manfrotto 488RC2

Supports up to 17 pounds
Repositionable locking lever for most comfortable use.
New ergonomic design.
New friction control for better control.
Quick release system features a new style secondary lock.

I've heard good things about an outfit with the unlikely name of "Really Right Stuff". I suggest this review
http://www.luminous-landscape.com/reviews/accessories/rrs-bh55.shtml