I have just recently purchased the RRS BH 55 ball head. It is VERY nice. Regarding the lever clamp with level - that was my choice. However, they also offer the clamp with a continuous knob (instead of the lever), if you prefer. I was quite taken with the "L" Plate as I do a lot of switching in "midstream" from portrait to landscape. This allows the camera to remain in virtually the same plane. Very, very, nice.

It's a good bit of money, but each time I use it I get a smile on my face...

Dale53