I've been using a Benro B-2 MkII Ball Head for the last 18 months, it's an excellent head, very well made and has fine adjustment and can be locked solid, it comes complete with an Arca type quick release clamp and plate. I have used this head with my Nikon D200 and Tamron 200-500 with no problems, I can recommend it.
See it here at this web link.
http://photopal.co.uk/product_info.p...products_id=42
nirofo.