Hi and welcome, nisrani!
Both of your setups are brilliant IMO. The BL8000 version is not that up to date, but it sure would sound very good. I have BL7-1, BL8000 and BL6000 and will get a BL2 soon. It sounds like heaven. But I am sure, that the BL5 setup will sound even better. If you go that way, I would recommand you to go for BL7-4 or BL10 as a center speaker, because the ALT-speaker work better together than ALT and non-ALT IMO. Because of the same reason, I would choose BL3 as rear-speakers with the BL5s...
Music washes away from the soul the dust of everyday life. - Berthold Auerbach