I am looking for a very good tripod ballhead.The ones that I have in mind are the ballheads made by Markins,Really Right Stuff,and Kirk.could anyone out there know who among Markins,Really Right Stuff,and Kirk make the better ballheads?Could you also please rank them in order?
Thanks.

They're all good. Anything in particular you're looking for?

I shall also be using the tripod ballhead for sports photography.
Thanks.

No experience with that. You might try sportsshooter.com

What kind of sports? Most sporting events don't allow tripods for safety reasons and are really not practical. I've shot pro sports for over 30 years(NFL) and only monopods are allowed. Same with baseball, and basketball not at all. Ball heads are not very practical on m-pods. Also, what size lenses are you using that would require a ball head.

What kind of Head would you suggest that I get for a Monopad to be used with a Canon 70-200 f2.8L IS Lens?Also,could you please suggest what Brand and Model?
Thanks.

Here's a good solution for a monopod. It's inexpensive too.

http://reallyrightstuff.com/rrs/Itemdesc.asp?ic=3232&eq=&Tp=

I looked them all ond went with the RRS

my order woiuld be
RRS
Kirk
Markins

I have a RRS and love it. Did quite a bit of research before the purchase. Excellent build quality and a joy to use.