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Some options are for budget you can get KYB GR2's, these are basically just a replacement, the KYB AGX's are an upgrade and are adjustable and more expensive, another option but more money again are the Koni Yellow's which are great and fully adjustable.
I should add that they don't make the KYB AGX's or Koni Yellows in a CSM-specific design anymore, you will have to use 1g DSM stuff. This poses issues, because the DSM suspension is longer, therefore you get less suspension travel. Once you factor in lowering the car, your ride quality and handling will go to complete shit. With that said, I used 1g DSM KYB GR2's with stock 1g AWD springs up front on my car, and I cut off one coil...the car actually rode and handled awesome, but the ride height was basically stock. I cut one more coil because I wanted it lower, and it completely ruined everything.
K-Sport makes CSM-specific coilovers, and it's pretty much one of the only options available if you really want to do it right. I never had success trying to use DSM suspension parts on my CSM. It will work, and you will get the look you want out of the car, but you will sacrifice handling and ride quality big time.