Well, in answer to the question above about the differences between the Pro Nav and Standard Nav in the MK 7.5, here are the main differences (I'm sure I've missed a few):
1. Pro Nav Screen size 9.2", Standard Nav 8"
2. Pro Nav has gesture control (from what I've heard of very limited desirability)
3. Pro-Nav has voice control built in where as it's an option for the standard Nav
4. Faster and beefier processor in the Pro Nav that allows the maps to be displayed on the AID as well as the Nav screen as the same time (standard Nav it's one at a time)
5. Pro -Nav has a DVD drive whereas the standard unit has only a CD drive.
6. Pro Nav has a a built in HDD to store the maps (for faster access) and to store about 10 gb or music / Video files which also frees up the 2nd SD card slot for music (as the Nav SD card has to be in one of the slots permanently on the standard Nav)
7. Pro Nav has a built in video decoder which allows playing of video files stored on the HDD / SD card etc.
8. Pro Nav can display 3D buildings etc in major cities which the standard Nav can't.
One benefit of the standard Nav over the Pro is actual rotary buttons for volume, scanning though media etc and 8 dedicated "mode" buttons down each side for quick access to Radio, Phone, Nav etc without going into the menus.