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I've been researching Subarus myself. Here is a site that I find very helpful. This first one is pricing information with dealer invoice for each trim level:
Rebates don't seem to apply to purchase with Subaru promotional financing
APR for the Tribeca, through Nov. 3rd:
2008 Promotional APR with Tiers
You were right on the border of Tier 1/2, score 700+, for 0%, vs. Tier 3, at 5.5%, so you may want to pull a current score.
It looks like they are offering you the (EDIT: )$3750 cash back from the original invoice price, so as long as you are OK with getting your own financing that's probably a great deal. If your score is over 700 now, you may qualify for their 0% up to 60 months, which you would have to weigh against the lower financed amount from taking the cash back at a higher APR. If your score is under 700 then you are definitely getting the better deal as it is right now.
I don't know how your previous bk would impact the promotional financing offered by Subaru.