I know you're looking to keep the stock suspension to replace in case you sell the vehicle, but I just wanted to chime in with my experience in not replacing the shocks. I just lowered mine on H&R sport springs(the 1.2" drop ones 50435-3). I bought my vehicle with 85k miles but it was clearly well maintained and lightly used. I decided to do a budget drop and only replace the springs and whatever installation items were needed. I figured if I wanted to put on coilovers later I could recoup some of the $250 on springs and all I would be out was labor.

When I got the shocks out of the struts in the front they were in very good condition...I can't tell if they've been replaced by they are in good working order. I was only going to replace the strut mount supports(~$20 total for both sides) but I ended up replacing the strut mounts(~$100 total for both sides) as well. Mine actually looked fine but I could tell the rubber bushing in the middle was weaker than it should have been, although it wasn't cracking. The strut mount supports actually weren't horrible, but just starting to flake/crumb, so it was time.

I've only put a few hundred miles on the vehicle, but I like it so far. For sure it's a little bumpier, but I wouldn't say it's harsh, just bumpier ride. I suppose the stock shocks will wear out faster being use in a lowered setup. The drop looks great. Only concern is the camber in the back looks off, I think I should get it aligned to maximize tire life.