OK. Say I'm thinking of just going 20"s. What's a good grey or black wheel to go with? Are there any staggered 20"s out there for the P85D?
Many many options of course. The TSW Nurburgrings in 20s have been used by a number of forum members, myself included, and are available in mirror face, bronze or grey, and are several pounds lighter than the stock rims. Ensure that the wheels you choose can support the weight of the Tesla, while keeping their weight down sub 30. The PSS in 255-40 fit, and give you a bit wider track. Vossen CVTs are a lightweight 20" option.
The PSS are glue on warm pavement, and so far the sidewall feels just as rigid on the 20s as the 21s (with PS2) on cornering.
I believe Tesla moved away from staggered with the AWD versions, but you could get those same TSWs with a wider rear track.
As for my approach, I chose the tire, wanting a Michelin Pilot Super Sport in 255-40 in a 20" size, then backfed into the wheel. The PSS is a very worthy successor to an amazing series of tires (the PS, the PS2 and then the PSS). I did not go staggered as I didn't sense a gain over the 255-40s would be had, and 4 identical all around is a bit less complicated.
The PSS have a modicum of additional noise than stock Primacy 19s, while you feel more connected to the road. In the summer, AC is on or the Windows are down, so any uptick in road noise is not noticed, and you are much more planted!