I randomly walked into the dealer yesterday to testdrive some boxster s pre-owned examples, and saw the 9k discount on s models.  can someone tell me what do 2010 boxster s normally go under MSRP without the 9k discount?  1K, 2K, 3K under MSRP?  or they sell at invoice?  could  I negociate this "normal" discount on top of the factory 9K discount?
I'm seriously considering picking up a new one instead of the preowned 2006 model I was looking at.  it comes down to paying 34-37K for a good pre-owned 2006 S or in the low 50K's for a new 2010 S model.   
I'm new to porsches and need to make up my mind before march 31 (when the 9K discount expires).  oh, and they also have 2.9 % financing....
please help.  thanks!!!