A rediculously hard decision...

Japanjay

No prob. Save around $500, plunk it down and finance the rest on a cheap accord or civic with a straight body and clean engine bay that some grandma or old lady has been driving for a long time. Find them all the time on craigs, well maybe not the civics, but the accords are a dime a dozen. Payments will only be around $100 at most spread over 4 years, if need be drag it over 6 and get an even lower payment for the time being, and then when you have some extra cash put it towards paying it off early as possible, preferably before the kid comes into the world if you can, that way the finished car payment can go towards dipars.

Save the Z for taking the boss lady out for a good dinner to make her feel sexy while riding in it and the dinner/movie to show her that you still want to have that you and her special time in your life.

Others will say just dump the Z, but if you can afford a little more plus the kid, get a cheap beater so you can still have some you and the boss lady time while the babysitter is watching the kid.