Thread is alittle old and OP hasn't been on since April, but I think this is a really good topic so I'll through in my 2 cents. I love my Denison barbs to death. You have to do some hunting around but you can generally find ok sized ones for $15 a fish where I am. Had a bad experience with silver dollars... they were skiddish because of the other fish tussling and that made the other fish skiddish, bad cycle. Haven't ever seen those spanner barbs but they look nice, I might have to do some research...