Yes, Track Mode is really the dealbreaker. I'm with you on all the stock wheel and suspension parts on the Performance. They're not worth anything because they'll be replaced anyway by anyone serious about handling and performance on the track. It's sad that we can't get Stealth Performance 3s anymore, though they also cost just as much as the Performance when they were offered (if I remember correctly). Anyway, since it does sound like taking it to the track is something you
definitely are going to do and you don't want to mess with warranty-voiding hacks, I think the Performance is your best option. As pg62 said, I would skip the FSD, especially if cost is a concern at all.
If only Tesla offered Track Mode as a software unlock...