I realize the boating season is winding down but I am curious what style anchors and and anchor systems people are using out there.  I am looking for an anchor that i can count on to set and hold a 21 ft boat in 2-4 ft waves in various bottom types. Right now I am using a digger achor with 150 ft rope and this does work pretty decent( probally 75% of the time) but need something when this fails to work. thanks.