Doing the 6019 with the KNAG510 add on is pretty slick and there are a few differences between it and the new 7100.
The 7100 uses dual drives, similar to the Pioneer Avic-d1 and d2, so the nav is on a disc.
Using the KGNA510 you actually update your nav using an SD card, which is pretty neat.
The biggest difference between the two is that the 7100 has a better looking and 3d user interface. But you can get hte 6019 with nav cheaper because its older. I know at my shop the package for a 6019 and KNAG510 just dropped to $1199, while the 7100 is right at $1500 I believe.
