If you're looking for all out performance...don't bother with ceramic bearings. Get a set of Tamiya blue shielded bearings and blow out all the grease and run them DRY or with a tiny drop of bearing oil. Of course, they won't last long but you get's what you pay for

Have a look at this article written by grand poobah David Beale: Built to Win - BMW Mini Building and Setup Guide

Hope that helps.