Three of the cabins you list are balcony cabins and one is an inside.
Of the four you list D734 is by far the best; in fact I'm surprised it is still available--the aft balconies usually go right away. The cabin is standard size but the balcony is much larger and completely covered; and you have a fantastic view of the wake.
C206 and C209 are also standard size, and the balconies are larger than the other standard cabins, and only partially covered. Either of these would be great.
R233 is an inside and a good location.