You'd want a surge protector that would not harm the sound, so I would suggest something passive, like Shunyata Hydra for example. I own 2 Hydra2 units. Very nice sound with reduced noise floor.
As far as the wires, after trying lots of interconnects and speaker cables, I found Acoustic Zen to be a very good match with the B&Ws. I use Acoustic Zen Satori Shotgun speaker cables. Awesome cables and very affordable. Interconnects I use are Acoustic Zen Siver Reference MkII from source to pre and Acoustic Zen Matrix Reference MkII from pre to amp. Just something to consider and put on your list of cablkes to try. IMO, should go with balanced interconnects if your components allow it(the amp and pre do, I beleive).
In any case, if you do go with B&Ws, make sure you get a proper speaker cable. B&Ws will not sound good with a single run speaker cables, you need a bi-wire sp cable set, prefferably a double run, such as the AZ Satori Shotgun. Check them out, they are specifically designed for a 3-way speaker, such as B&W 803D or 802D.
Best of luck. You'll have an awesome system with the McIntosh and B&Ws.
by Audphile1