I'm looking to buy a new tripod and was wondering what sort of recommendations you guys had. I have a Canon 40D with a 17-40mm and a 28-105. I don't really want to spend more than $200 on a tripod. I was looking at some of the Manfrottos and was wondering what your recommendations were on the 055xb with either the 496RC2 Head or the 498RC2 head. What are the main differences between the two? Also, do you think having a panning rotation function is critical?