Bear in mind that the Z's brakes whether sport or standard tend to overheat at the track due to lack of cool ducts. I think steel lines help maintain consistent pedal feel but only when teamed with high temp fluid and better pads.
On the sport v. base issue. Think about it for anywhere between $3-4k you get some nice lightweight wheels, an lsd (crappy but functional), synchro rev on the m6's and a big set of brakes. If you did any of that in the aftermarket the wheels alone would be more so when it comes to bang for the buck the sport package rocks especially for the m6 guys, I love synchro rev.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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