Originally posted by C_Jones Sirui K-20X is the ball head I use
Well, your requirements are met by most good quality ballheads. Recommending one above the other quickly dissolves into fandom because we cannot be expected to have experience with all the heads (except for Panoguy maybe).
I know Sirui constantly gets recommended as better than their price tag. I can say I love my K10X, and even the C10X that came with my Sirui tripod was pretty good.
That being said, I also have a Vanguard head (discontinued model) which is every bit as good, so there you are.
Go with the size you can accept (a too large head wouldn't have fit on my travel tripod for instance), the weight requirements, and shop for prices going on from there.