This forum has been extremely helpful to me in making my buying decision as well as other questions. As such, thought it may be helpful for me to post my pricing in case it helps others.

Used American Express Auto-Purchase Program (very easy):
$37,981 ($500 off Invoice)

-2010 Black G37x Sedan
-Navigation Package
-Premium Package
-Interior Accent Package (wood trim)
-Non-sport Splash Guards
-Trunk Mat
-Trunk Net
-All Weather Floor Mats (originally priced with Vehicle Impact Sensor but since I decided not to get that, we swapped for these instead at the dealer --- close to a wash on price and I was going to get them anyway)