I've got the same kit as Stand and Deliver, but I use denatured alcohol. I don't know what's best. My neighbor shot his mini-logos with an aerosol can of Brak Clen (I think that's how it's spelled, it's pronounced brake clean) from the auto parts store, and that seemed to work really, really well. The thing to keep in mind is: what effect, if any, will the agent you use to clean the bearings have on the resins in the races. I know some of those citrus de-greasers can damage some plastics.
I guess someone really just needs to go to a slalom event, or ask the Dreggs crew what they use.
Oh, and I have Swiss 6-Ball, and they seem just okay for speed, but it's hard to tell how a bearing will react under your weight and under prolonged periods of spinning when you're just spinning it in your hand. I tell myself that the 6-Ball are built with such high tolerances, though, that they will last for a long-ass time. So far, so good.