Assuming you don't have to worry about any classing rules for modifications to the car I'd pay the extra money for the SPL arms.
As far as how much camber, I'd go at least -2.0. After that, it really depends on how much street driving vs track driving you do and how often you're willing to replace your tires. fwiw I run -3.0 on mine that I use for autox.
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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
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