The
Fin-nor Offshore series have proven to be great options as well. Very inexpensive for how capable they are. Not as refined as a Saragosa but a good option as well.
Are you looking to get on board with the butterfly craze? Personally around the shop we kind of chuckle at it (greatest lure and tackle marketing effort ever by the fishing industry
) but it does simplify putting together a matched jigging outfit.
They do dance a little better and the hooks being at the other end help to keep them from hanging (you can switch them to the other end on traditional jigs as well), but overall I think an experienced jigger with a Crippled Herring or diamond jig is always going to smoke your average guy wielding a butterfly set up.
I don't mean to rag (too hard anyways) on the "Butterfly System" but if you don't want to spend the $$ to give it a try I wouldn't feel like you are missing out on some end all and be all jigging system.
I should add I am NOT the most experienced vertical jigger in the world, but in my limited experience that's my take on it. Someone more experienced with butterfly systems may have a different opinion.