No need for an EAI Superstar if you're not racing on the drome. EAI's regular cogs are super nice as it is. Also, no real need for that spendy chain when KMC Kool chains run great with a little lube added. As far as the chainring, nicer chainrings are usually more round/true than lower quality ones, and this does make a difference in performance (not that noticeable assuming chainline is straight and everything else is in order but it's there) and safety (more leeway in chain looseness before you'll throw it).
Main things that matter on the street are that your drivetrain allows you to run a perfect or near perfect chainline, and that you maintain your chain through cleaning/lubing to ensure longevity in the drivetrain and also gain performance efficiency.