If you're going with the Limited then get the 6-speed, I absolutely love it. Insurance really isn't all that bad for these cars. I have no marks on my record and I only pay $85 a month with Geico. I can't imagine the SRT being that much more expensive, plus Geico can give you a quote in a matter of seconds.

You can find reasonably priced 350Z's for under $25K that would suit your tuning needs but they're a dime a dozen now but it really depends on what you want. I drove one and thought the clutch was WAY to heavy, heavier than the clutch in the 16 ton truck I drive almost everyday

Good luck in your search