The STi or EVO as a family hauler is far from a smart move. Have you ever driven and inspected one?
If you buy the hatch version of the sti? Maybe? But the sedan version of the Sti and evo completely suck as a family hauler. The evo build quality is awful for anything more than just having lots of fun in the car... I mean, mustang and camaro run about equal in overall usability to these cars.
I would follow the advice of other members on here or have you considered no money down low cost leasing of an altima. Residual value is so high you won't pay any to very little depreciation. You can pay as little as $200 a month for 39 mo. Then switch up to something new later? That way by the time you switch up, your Z is paid off and you can move on to the next family hauler with more room to breathe.
As far as the Z goes... GO FI. I drove a stage II gtm g37s before and the vq37vhr is ridiculous. None of the current v8's are anywhere near as fun with FI as a vq. These engines were meant to be turbo'd. I will guarantee you anyone who FI's there Z or G will fall in love all over again and will never part with it.
