You guys are confusing the Pioneer models.  I am talking about the D1...not the N2.  (i think that's the models!)  The D1 has the exact same double din full screen just like the Kenwood.
http://www.pioneerelectronics.com/pna/product/detail/0,,2076_3151_218219118,00.html
You will find it has two slots behind the screen...one for CD's just like the Kenwood, and another for the NAV DVD.  It's a very clean installation and all the reports I've read rate the NAV system and DVD very high!  The only two reasons I would shy away from the Kenwood is the price with NAV, and you have to find a spot to mount and wire the additional DVD drive.  But your right...if I wasn't interested in NAV, I would be all over the Kenwood.  It's a very nice unit.
By the way, the street price on the Pioneer is under a grand.