I made a SS copy of the Bruce claw years ago that I used for anchoring my fishing vessel when purse seining. Superb anchor and I was pissed when I lost it one night. I could not afford a real one. Check out how much a new 33 lb galvanised one cost now!
Steer clear of any plough anchors, and stick with the spade type. I made a copy of the Ultra. They are ridiculously expensive new but are good. For cheap go Manson Supreme or if you want just a bit more quality go Rocna. Download the templates for the Rocna and make a ply or cardboard version to see if it fits on the bow.
www.petersmith.net.nz/boat-anchors/manson-supreme-anchor.php Peter is a little bitter here but he also copied details for the Rocna from the Bugel. The Bugel is still a fine anchor too.