Hi, My wife is buying me a set of 055XProB tripod legs for my birthday. I am trying to decide on a head. I am leaning toward the ball head. Specifically, I see good reviews on the 488RC2. In my research, I have hit the following unanswered questions. 1) What is the difference in the 488RC2 and 488RC4? 2) It seems that the 488 series is a 468 with a pan lock? 3) Any major advantage of ball heads to 3-ways? Just personal taste? 4) I also like the 322RC2, but it's a bit more expensive. Worth it? Any feedback is appreciated here. BTW. I chose the 055xPROB because of it's reviews, name brand, and height. I am 6'3".