I also rely on Amsoil products. They recently came out with a line of race-specific oils also.
http://www.amsoil.com/news/2008_Dominator.pdf
However, Amsoil does not recommend mixing any additives with their products citing that their oils already have a pretty complete anti-wear and anti-friction package included and mixing chemicals could compromise them. I tried a variety of stuff years ago before switching to Amsoil and didn't see any long-term benefits in any. I've always used straight Amsoil products and have seen the benefits on the street and the track.
For more info on the oil and dealer/wholesale pricing, you can contact the person I deal with - Dan Watson.
www.thelubepage.com