At the risk of sounding redundant, I wanted to put together a coilover list. There are a few of these threads/topics around the internet already, but lots of them are from years towards 2006 (I didn't even have my driver's license yet) and have old, outdated links, or are not very comprehensive and easy to read.
I am looking at coilover sets for my '78 280z so these links will be specific to that (mainly so I can reference it later). Assume that all are ride-height adjustable. I didn't look super hard for lowest price, so the options may be cheaper somewhere else.
Order: Expensive --> Least Expensive Format: Name | Cost | Colors/Special Notes | Link
TechnoToyTuning Coilovers | $2040 | Maroon/gold, NO-WELD (send in your cores) | https://technotoytuning.com/nissan/280z/front-coilover-conversion-datsun-240z-260z-and-280z + https://technotoytuning.com/nissan/280z/rear-coilover-conversion-datsun-240z-260z-and-280z
Arizona Z Car Coilover Set | $1600 | Red\Silver, camber plates | http://arizonazcar.com/coil.html
Stance USA Coilover kit | $1295 | Black/Bronze, Camber Plates and Swift Springs @ +$300 each | http://sakuragarage.com/products/datsun-suspension/
BC Racing Coilovers - BR Series | $1200 | Black/Gold, camber plates | https://coiloverdepot.com/products/74-5-78-nissan-260z-s30-bc-coilover-br-type?variant=16741482757
KSport Control Pro Fully Adjustable Coilover Kit | $1080 | Black/Orange, Pillowtop Camber Adjustability | https://www.andysautosport.com/products/ksport__cns361-kp.html
D2 Coilovers - RS Series | $1000 | Black/Purple, camber plates | http://www.sparktecmotorsports.com/d2-d-ni-01.html
Megan Racing Coilovers | $900 | Black/Red, Pillowtop Camber Adjustablity | https://www.andysautosport.com/products/megan_racing__mr-cdk-280z.html
CX Racing | $869 | Black/Red, Pillowball mount & Camber plate adjustable | https://www.cxracing.com/coilover/coilover-nissan-infinity/CO-B-280Z-0405-PB
Ground Control Coilover Kit | $429 | Maroon\Yellow, No adjustability | https://www.andysautosport.com/products/ground_control__6020.01.html
Other
Evolved Front Coilovers (FRONT ONLY) | $1290 | Maroon/Gold, camber plates, NO-WELD (send in your cores) - Don't seem to list a matching rear set | https://technotoytuning.com/nissan/280z/evolved-front-coilover-conversion-datsun-240z-260z-and-280z
Intrax | $??? | There are 4 options on their site. Can't find any pricing. Made in Holland. | http://en.intraxracing.nl/merken/datsun/
If I missed any, let me know and I can add them.