Here's the thing: when you buy a pro-quality tripod, you get just the tripod. It doesn't come with a tripod head affixed like the cheap-o tripods do, so you'll have to buy one separately (by the way, this ballhead thing isn't necessarily about getting sharp images, but it is about keeping your sanity, so I thought I'd better throw it in). Ballheads are wonderful because with just one knob they let you quickly and easily aim and position your camera accurately at any angle (which you'll find is a huge advantage). Best of all, good ballheads keep your camera locked down tight to keep your camera from "creeping" (slowly sliding one way or the other) after you've set up your shot. Like tripods, a good ballhead isn't cheap, but if you buy a good one, you'll fall in love with it.
