i got my powdercoated MM subframe connectors from american muscle for $159 shipped to my door, that was about $15 cheaper than stangsuspension after shipping and discount.
If it were up to me, I'd do the detailing myself and not have anyone at the dealership do it. It's not very hard and the results will be great with the right products.
i only use microfiber. You can use skeepskin mitt or microfiber mitt to wash, and for drying I use a big waffle weave microfiber towel and I pat down when drying instead of dragging the towel across the paint. Never heard of using diapers to wash the car