The Really Right Stuff BH-55 Ballhead is a workhorse piece of equipment and the company is a leader in the industry. Check out this review of the BH-55 Ballhead.
The Nikon 80-400mm f4.5-5.6 AF-S is supposed to be an update of their older model. However, this lens is much more than an update. It is seemingly a full redesign on the inside with only minor tweaks to the outside. If you are looking for a reasonably priced telephoto lens that will allow you to reach 400mm then this is the way to go.
You can watch my in field review of the Really Right Stuff TVC-34L or you can take a quick look at the pros and cons below. The bottom line here is this tripod is exceptional in every way you would want it to be.