here's what i would do. you're a teacher you should be smarter than me.
from the sound of it, your wife like the word "save money."
so...
sell the SUV to carmax or somewhere that will just take the car and give you a check. Pay off the loan/lease. you might be in the red a few grand, dont worry just pay it off.
Drive your RX7 for a year and save up that $644 in your future car budget. remind your wife frequently that you are making a sacrifice by driving a pos (?) car but want her support on buying a new Z a year later (pschological approach). show her how much the car means to you and all the sacrifices you made through the years.
buy a 2010 Z next September (or even find a used 2009) during end of year sale where you get the best bargins.
.... hope it works.
