I finalized my White MS on 6/21. I was utterly sure of my choice. I've seen an occasional blue on the road, but none really up close. Just 5 days ago, I saw a Blue in the Tesla showroom. I was blown away. It looked so much more aggressive, that I immediately called my DS and asked if it was possible to change. Several hours later, my dashboard showed my Blue being sourced for parts.
The one in the showroom had the grey 21"s. They looked incredible!!! However, I am sticking with 19" for practicality. If business is good this year, I will upgrade to 19" aftermarket rims in a darker tone.
One last comment: Get a good detailing with some type of paint protection. I plan to make this my first task after delivery. The Blue does indeed easily show swirl marks, fingerprints, etc. Being inherently lazy about washing compared to when I was a teenager, I was concerned about this. My passion is really high for this car, so babying its appearance will not be a problem for me. If you park on the street a lot, your car, along with black, will look dirty more often then it will look clean.