Sherod: sorry there are no hard & fast answers to your questions. Opinions vary all over the map & many are simply opinions based upon no particular experience, but you'll get them nevertheless. Opinions are like ... well you know.
That said: I have * read* of the experince of many others who far preferred wire-jumpers to those connecting bars. I have no experience with either method. I use single-biwire myself & it worked well for me, but that doesn't mean it will be best for you. Regarding specific combinations of mix & match, that can go either way. The only way to find out what will work best for you in your own system & with regard to your own particular sonic tastes is to experiment. Silver cabling can be a bit "zipppy" & some will prefer that effect. Silver plated copper is different too.
That said: I have * read* of the experince of many others who far preferred wire-jumpers to those connecting bars. I have no experience with either method. I use single-biwire myself & it worked well for me, but that doesn't mean it will be best for you. Regarding specific combinations of mix & match, that can go either way. The only way to find out what will work best for you in your own system & with regard to your own particular sonic tastes is to experiment. Silver cabling can be a bit "zipppy" & some will prefer that effect. Silver plated copper is different too.