What day? If its Saturday then get the fast lane plus with admission. Always a good time with that, especially dealing with Volcano's line.
As for Anaconda, it's not rough. I've been on it a bunch of times, different days, different seats and very little to no headbanging. Its not a bad ride at all and actually, the first half of the ride is pretty intense.
Have a great time, KD is one of the better cedar fair parks out there.
Thanks for the advice! I'll be going on a Sunday and I've been told by others that I should be fine without fast lane.