The Arca Swiss Cube is a fantastic precision tripod head. It moves like a swiss watch and works great. I'm not using it in the studio yet (because I mainly do portraits and only rarely still life images) but I'm planning to take it out for some land- and cityscapes as well as some architecture shots.
The Nikon D4 is my favorite on-location camera. It's the most reliable camera I ever had (taking this title from my old D3s which it replaced). The 24-70mm lense is very versatile and on my camera 95% of the time. Only for travel I switch to the 28-300 which has a much lower image quality but is more comfortable to carry around. The Really Right Stuff L-Frame makes it easy to use on a tripod with either the RRS Ballhead or Arca Swiss Cube.
In the studio most of my work is done using a Hasselblad Medium Format-camera. Compared with the common Nikons and Canons cameras you might use at home this camera has an incredible tonal range (especially for skin colors in my case) and detail. At 40 MPIX the photos will usually be bigger than what you need (unless you want to print a billboard), but it gives a lot of room to make your image look best in post-processing. The 100mm and 120mm lenses are two of the best lenses available for this system.