here's the deal. If you need the money because you financed the car, and now you need $$ for baby stuff, then sell away. If the car is 'paid for' as you built/bought it, then keep it, and enjoy the occasional date night with wife. My kids LOVE riding in the cobra. One at a time, of course.... my youngest is 5, and she rides more than any of them!
Now if you need to buy a bigger house, or get out of an apartment with the $$ from the sale, then do what ya gotta do!
Good luck. I have lots of baby names picked out!!!
Kristen
ps. the car is kinda my '5th' kid! It was either another baby or a car. I opted for the car....