Well welcome back. I think there are a few centres around at the moment (from 5kCs -Ricky to 7k2.2 -me) plus speakers left after SE upgrades.

There is a school of thought that SL is better SQ wise because it's a balanced digital signal rather than SPDIF, it gives you an opportunity to home run cabling rather than daisy chain but I think you'd need to be listening hard and for HT, I don't think you'd miss too much.

Hope it goes well.