Sam, yes, use the 8 ohm setting in your 659 for the B&W's. Also, as you look for 601's, try to get the DM601 S2, and definitely stay away from the original 601, as it did not have the Nautilus tweeter tube like yours. At the time I was selling these, we primarily used B&W subwoofers with them, but there are many good subs available today. Do you have a budget for one?
As far as mounts and stands, sorry, don't have a recommendation, but there is so much available if you do a google search. Again, just make sure any ceiling mount has the adequate weight limit for the speaker, and attach securely to the ceiling joist.