Its a very difficult question to answer as much depends on your previous cars and what you - personally - have been happy with. I have the 30d M sports with the sports suspension and 19" wheels (in summer).
I find the ride acceptable. Its much poorer than the Lexus GS430 that I owned, but much better than the Honda Civic Type R that I owned.
Ask yourself what type or ride you want? How do you feel about body roll? What type of driving experience are you looking for?
I went for my current spec as I wanted a 4 by 4 that handled and drove in a sporting fashion. It meets my needs.