16's are certainly cheaper but I suppose it all depends on how many miles you do and how often you change them.
I run General Grabbers 255 55 19 on my D3 and they are a comfortable ride. They are also wearing well, covered 26k miles and still got half the tread on them if not more. Not sure the more tyre the more comfort but GG's work for me, wear, value and ride wise.
Not sure if his helps