The premium stock sound is a huge improvement... Though I've been having iPod loudness issues. With the volume up to the max on both the iPod and the car, it still isn't as loud as it gets with CDs... I gotta use the AUX video inputs to plug in the iPod, which probably is the reason.
Yeah, stock nav screen...I debated buying the car because the nav adds a grand or so to the price and I don't use the maps often... But just the touchscreen alone gives you such quick control over EVERYTHING. DEF WORTH IT.