Pro-Deforestation?

It may be the beginning of the end for our status as a non-minivan owner.
A check engine light on the Subaru refers to some wonky O2 converter dealie that isn't leaking, isn't broken, just a 'fault' that will take $800 to replace.
Considering that my back has been feeling mooey tair-eblay driving it the last two weeks, and that Ryan isn't growing like a middle linebacker (thereby allowing us to move him into a smaller booster and giving Ainsley her car back), we're thinking that we may need to get a new family-centric auto that either she can use so I can have my Escape back or
well, really, that would be it. No or.
Buy used? Certified? Carmax? Lease a new something for 3 years until the Escape is paid off? Buy a new if it has 0% APR? Honda Odyssey? Toyota Sienna? Hyundai Entourage? Chrysler Town & Country? Indian TaTa? Ford Crossover Utility Vehicle? Another Hybrid? What can we afford with the promotion/pay raise? Why can't the internet answer all my questions at 1 in the morning when I'm exhausted with a <1 month-old who Just Won't Let Mommy Sleep Dammit?