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Adding a couple of more revolving accounts will help. Who did you include in your BK? Have you tried the Cap 1 Auto Nav for the auto loan? There's an entire thread on Bk friendly cc's. I would definitely research that along with the thread on how to get to 700 after a Bk. I would say to choose your cards carefully. You don't want to end up with a bunch of store cards that you'll never use. Store cards can be good for rebuilding but pick the ones that you'll actually want and research them to see how Bk friendly they are.
can I ask why you want such an expensive car?
I would also look into joining NFCU