bmw 330d

Hi guys.. Need some advice here...
Im in the market for a 330d e90 lci.
I found a 2010 M sport auto with 100 000km on the clock going for R199 000...my questions are:

Is this a good price?
Hows the maintenance out of plan?
Does it have resale value? (plan on keeping it about 1.5 -2 years)
Hows the consumption compared to a e90 320i?

Im in two minds about car as I uave never owned a diesel before..

Any advice please..