PATIENCE, Dev -- patience. It is WAY too early for you to expect much more than what she's spewing right now. Just put on the spew raincoat and steel yourself, as it's going to be a bumpy, messy ride.
It's PERFECTLY SCRIPT what she's saying right now. I've seen literally THOUSANDS of stories that vary very little from just two or three basic scripts, and while I know that doesn't make the sting burn any less, it IS nevertheless "normal" for someone in an affair (not to mention her other mental/emotional issues).
As for the cars, I would just suggest you tell her "considering our current marital and financial situation, I don't think that would be wise right now," and talk to your atty about it. ANYTHING NEW you provide for her right now is going to just be folded into her "customary lifestyle" should you two D or LS.
Avoid the R talks, keep focusing on your GALs, and defer to your atty on anything legal/financial . . . and protect those kids.