Let's compare @
Racecomp Engineering Tarmacs/Bilstein B8s to RCE Tarmac Zero coilovers, since they're the same company, same spring rate, etc... I think the spring/strut combo is about $1200, coilovers are about $1700. So what makes the coilovers better, since they're $500 extra?
With the coilover you get stainless steel construction and height adjustability. You also get dampers that are perfectly matched for the springs they're used with. With the springs/struts their rates are very very close, but not perfect. You could have the struts revalved, but then you'll be up to the price of the coilovers anyways. With either set you would need to keep the OEM top mounts or buy super awesome camber plates; @
Raceseng makes awesome ones, HVT makes very good ones.
Also, what cusco coilovers are you getting for $1800 that come with camber plates?