So......what do you use under your speakers?

Looking to replace the stock spikes on my new speakers (Vivid Audio) that will make improvements in sound as well as give me a little more height. I have a commercial grade carpet over concrete with no padding. Not really looking to alter any frequency range but wouldn't mind general overall improvements in clarity, imaging, etc. I have been looking at Eden Sound Terracones, Stillpoints and Wave Kinetics. Price is not a deal breaker. TIA.