We found an 07' DTS Performance, and an 07' STS awd v8, both for around $31,000. and both have 22,000mi. My wife will be trading our 03' STS, and our question is, about what can we expect for a trade on this really clean, 50,000mi. blk/blk car? (n/w Indiana area) Anybody willing to tell about their trade deals with dealers? What is the average we should pay for either car with a trade like this? Our car still is 'cpo' till june 09'. We will want 'new' car to be CPO also.