Sorry to crush your dreams, but you're going to have to look for a used one to keep your payment that low.
Sport + Nav + Touring = MSRP of $40k+ BEFORE taxes and financing costs. After tax and financing you'll be looking at closer to $45k.
Just to give you an idea:
If you borrowed $30k over 6 years at 3.5% interest rate. Your payment would be $462 a month. Now remember you need to tack on insurance on top of that too (likely another $150+ a month).
Even a used Touring + Sport will run you around $32k base, plus tax and financing it would be $36k+
Also to answer your question, you cannot add the factory Nav into the car. People will install aftermarket radio decks that have Nav.
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350z / 40th 370z / C6 Z06 / BMW M4 / V10 R8 / C7 Grand Spot / 997.1 GT3 / S2K / Camaro ZL1 / 718 GTS / 991.2 GT3
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