4 in lift on Blazer

[Facetime]

I apologize in advance if this topic has been beat to death. I did several searched but couldn't the answer I was looking for. My blazer is a daily driver with the occasional foray up into the mountains of Idaho. It is dirt track no where near rock crawling of stump jumping. My options for lift are: kit, ($1200-$1600), all spring rearch( $800), or shackle flip, (by ORD), in the rear and rearch upfront ($600). Pricing is always a factor but not the deciding point. As it is a daily driver for me and will be my son's in about 3-4 years ride quality, safety, and longevity is paramount. I have a local spring shop that swears the springs will not sag if rearched but most threads I have read say other wise. I have heard that original springs with a shackle in the back are a better ride than stiffer springs from rearching. Anyone have any experience with rearching vs shackle flip or kit?

I know that shocks are a big testament for ride quality and was looking at the Rancho 9000 series. Any negative comments on those? I have read only positive things about them. Thankx again for everyone's insight. This forum is so valuable for a novice. Cheers!