PCMark. 3DMark, Cinebench. Whats important is to run the benchmark several times, and see how the score changes after each run. Also to prevent background program from interfering with the score, make sure the benchmark program is running at either “Above Normal” or “High” priority.
For storage we could use CrystalDiskMark.
I would go with a range, so 80-100, 100-120, etc. with even ranges so you can see the bell curve itself. (If you put smaller range towards the expected value, the graph would then look flat)