Switched from manual fileting to electric last year. Got an American Angler 110v from Walmart. So far, so good. Bit of a learning curve for me, but it's the way to go.
Link to American Angler knife at Walmart
If you go with the American Angler, check out this thread about the blades.
http://www.crappie.com/gr8vb3/showth...2round+hole%22