I'd be looking at Dobinsons and Fox if it were my vehicle. Nothing really wrong with the Bilsteins, but I don't think they're as long lasting, and also there are very limited coil options for the front due to that body size. It's incredible how many people need to buy replacement coils only and want to keep their shocks, so that's a great feature of the Dobinsons. I don't know if Fox offers a variety of coils to suit those coilovers, but Dobinsons definitely have the award for biggest coil spring variety for 4runners, without a doubt. The IMS body size is that size specifically so that the full coil range can be used, in addition to it being really ideal for this size of vehicle. These IMS shocks run a 50mm piston, whereas the standard Dobinsons twin tubes run 35mm pistons, so that's a huge jump in piston size overall.
IMS have a fully threaded body. I know Bilstein uses clip heights to adjust, and I think the Fox option does also. Clip options are a lot cheaper to manufacture, but also require removal from the vehicle for any adjustment. A fully threaded body can be adjusted on the vehicle, although making sure the threads aren't dirty is important, so most would remove them and compress the coil to clean the threads before adjusting.
I too don't know why Bilstein did the small rear resi. I think it was for looks and a slight performance increase.
Dobinsons offer the resi version also, but you're jumping up way higher in price. I had one guy buy IMS front struts for simplicity, and resi MRA rears so that he could adjust and tune the rear for variations in loads, and the rear is more likely to bottom out more often, so using the full stroke of the resi helps with dampening forces, especially with the 3-way adjustability.
Pricing - Dobinsons includes rear coils and the other 2 options don't, unless they just don't show them in the picture. Rear coils are ~$200 if you buy them separately. You're picking and choosing the correct coils to suit your loads and how you want it to ride with the Dobinsons kit. It can be built with all the drop downs however you want it here:
Dobinsons 1" to 3.5" Lift Kit for Toyota 4Runner 4x4 2003-2009
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Been in the offroad industry since 1998. Born & raised in Australia - currently in Jax Beach, FL. 2014 4runner Trail, 3/2" Dobinsons MRA Suspension, Shrockworks bumper and sliders, M8000 w/ Treaty Oak winch line, LFD Roof Rails, Dobinsons 2m Awning, RCI skids