I'm a LuNa shipper first then SaNa shipper second. It's an interesting dynamic were Luffy views Nami as intrinsic to his life, Nami views Luffy as her treasure (Nami could have easily chosen to live at her village after Arlong's defeat, but, instead, chose to willingly become what she hates most; a pirate. Why? She loves Luffy), and Sanji simps for Nami but also truly loves her.
Nami is very fond of Sanji, Nami is just very intelligent and knows that if you give him an inch he'll take a mile, so Nami goes out of her way to not flirt with Sanji directly.
Nami argues with Luffy very much like a wife argues with her husband, and in Wano we had Nami and Luffy become parental figures to the same child, Tama.
IMO this won't come to a head and Boa Hancock shows up. Romance on the crew is impossible because Luffy just isn't interested, but, once Boa arrives at Elbaph, we'll have a Nami vs Boa showdown based on Boa challenging Nami for Luffy.
EOS I expect Nami to be with Luffy but also be with Sanji, like Rayleigh has Shakky but sleeps around.
Zoro is the dark horse here, because Zoro is the character that typically ends up engaging with Nami in financial disputes, which is also a trademark of romantic couples.
There's a chance Zoro x Nami happens at the end of this series like Vegeta x Bulma did and pisses a shit ton of people off.
IMO, though, Nami will follow Luffy forever after Arlong, and Boa's attack on Nami will make Luffy have to come to terms with the fact that grown women actually want the King Kong Gun.
Chopper x Carrot is still the best Straw Hat ship, but if I speak more about this, I be in big trouble.
Sanji will end up with Pudding. His entire character focus is kindness, and Sanji's kindness purifying Pudding's broken heart is a plot point Oda's not done with.
IMO some hoe is coming to pull up on Sanji and start beating him up, and when Pudding shows up she'll kill that bitch dead.
Expect Pudding in Wano Act 4, she's important because her Fruit is the only mechanism to make Linlin recall her memories of eating Mother Carmel.