Well you are prob the only one who hates doing black cars! I find them the most rewarding. The rotary should bring out any imperfections no problem with megs #80.
As for microfibre cloths, the more you spend the better quality you will get. I have megs, poorboys and zymol cloths and all are of very high standards. When washing them use a non bio liquid, do not use powder as it will stick inside the weave of the cloth and cause scratches. Best thing to do is check it on a cd before using it on your car, if it scratches the cd then you can be sure it will do the same to your paint.