For broadcast DV 8-bit is fine – it’s FCP’s native uncompressed format so everything plays on the fly. You can use Animation or None but you end up having to render and re-render everything in FCP. If you’re REALLY worried about quality you can use DV 16-bit but it’s not neccessary and will slow down your workflow in FCP if you need to do any further finishing to the final sequences. Once everything’s encoded to tape there isn’t any difference.