I bought the 128GB both for the storage and hopefully smoother performance memory wise. I think if you're just doing carplay you might be OK with less but I wouldn't get the base model either way. I've installed Plex on mine and have downloaded/synced a bunch of movies over! Too bad there's no video out support.
Good to know! I was scratching my head why you would need 128g but that makes sense for movies. Definitely a shame there is no video output.
Also, any extra items you recommend or regret buying with the unit? TPMS, power filter, backup cam, ect?