I'm afraid that something to come out like "one of those little dudes" would be quite a feat. That's a very high quality betta, not something you could produce with pet store bettas. Anyways, you could breed for fun with pet store bettas, but you won't get anything that will be spectacular in finnage, or colors, since they will be mixed. If you want to breed a crowntail, I would suggest breeding it to either another crown, or a halfmoon/delta tail if you have one - though they are another tail type that is rare in pet stores. This way you'll get the best finnage.