MeDieVal, I highly recommend you avoid Spice and CP 47,497. If you don't like weed, they are far more similar to it.
JWH-018 is the least like cannabis, but also the consensus on Bluelight is that it's more anxiogenic than cannabis for most. For me, JWH-018 is heavily anxiolytic. JWH-018 is also lacking most of the brain fog, motor incoordination, and general retardation side effects of cannabis and CP 47,497.
CP 55,940 is somewhere in between CP 47,497 in subject effect for me. I would highly recommend JWH-018 or CP 55,940 but not any of the other available synthetic cannabinoids.