USB cables. My 24 had the cables and wheel locks. The 27 did not have either of the two. The 27 came with leather key fobs and a carrying case. I think it depends how the cars are packaged from the factory or outfitted at the port...or some combination.
Here was my path: test-drove 25 performance MT, bought 24 nismo, sold 24 and bought 27 Nismo MT. You seem to know what you want. I suggest test-driving them all and seeing which one speaks to you the most. The sport and performance are a better value if you plan to modify a lot, but you may...
I don't know about the SD dealer other than seeing their posts on FB. Nismo Nick got me into a 2024 Nismo, and I had a great experience with that, so he earned my loyalty. He's a great guy and a friend, too.
There's a dealer in San Diego that sells MSRP, no markups. I'm a loyal customer of Nismo Nick at Pinnacle in AZ. I purchased my Nismo 6MT this week for MSRP and flying in Saturday to pick it up and drive back (to L.A.).
My stock 24 Nismo had a 3-4 and 5-6 flare only when cold, manual or auto mode. I found that by driving in Sport mode it would eliminate the flare shifts completely.