West Marine's "Tradional Anchor" series are a Danforth style anchor. A 22-S or larger should work for your boat based on the size and the bottom conditions you described. Your anchor line is over sized for your boat which is fine, but will jerk on the anchor and not provide the "shock absorbing" function of a lighter line. When figuring your scope, be sure to add the height the cleat is above the water, ie: 10 foot of depth + 3 feet of freeboard = 13 X 7 = 91 foot of anchor line needs to be played out. As I am sure you realize, each time the wind direction or current change you will have to reset the anchor, just be sure to get the anchor set in the bottom. Scope should be figured from where the anchor is dropped and not the depth that the boat ends up in. Hope that helps!