Here's the tl;dr version: as long as you use a good-quality filter and oil (
see the multitude of previous posts on the subject for some examples of "good-quality"), it doesn't make that much difference for a DD.
From what I've seen, you pay about the same in the end. But that probably varies a lot, depending on the shop and your relationship with them. Best thing I can tell you is to call some of the shops in your area and ask for pricing.