Abb, as to your question re: A170, I thought I post it here, just in case it'll be useful to someone else. As I said MB changed the model numbers during 169 lifetime (not actually changing engines, other than dropping 2034cc one).
Here's the model lineup from 2007:
and 2011:
These are screenshots from 2007 and 2011 brochures - I added the year on each page for clarity.
Here's the model lineup from 2007:

and 2011:



These are screenshots from 2007 and 2011 brochures - I added the year on each page for clarity.