I got the anti-glare screen cover and am happy with it. It significantly reduced fingerprints and does help with glare, though sun coming through the pano completely washes it out. I also got the leather fob pocket, which like Morristhecat, sits in a drawer. I actually don't use any cover and just don't keep anything scratchable in the same pocket as the fob. Lastly, I got the AlloyGator rim protectors, which I have yet to put on, but think are a great insurance policy against curb rash. A great and inexpensive investment. I'm thinking about the license plate lights, but what I really want is much better LED reverse lights. I also got Lloyd's Luxe Mats, which are very nice, though the fit could be better.
Oh, and I got the Tesla plush blanket when at the factory one day. Lame, but couldn't resist!
Have fun!