Thanks for the input. :)

I think I am going to order the Cabelas brand-- Advanced Angler Pro Series Drift Sock. 38" diameter for $62.99. No sales tax and free shipping for me. They say it is enuff for a 24-27 foot boat, but I don't believe them.
I like to fish when it is rough, and I don't think you can have one too big. Also, while these things are not true sea anchors for safety, this will have to do if need be.
It is only 13 dollars more than the 29" diameter which is supposed to be for a 20 - 22 foot boat. It has weights and floats and a dump strap. I hear you should add a good snap swivel to eliminate twisting, even with the weights and floats.