Ahh, another oil post.....you did say
"best", so I would recommend Redline as first choice, or Maxima Extra as second.
Pick a motorcycle specific oil that is API SG/JASO MA. The SG insures that it has ample amounts of additives to protect you cam and any gears, and the MA insures it will not make a wet clutch slip. (Note that Redline is JASO MB, yet still ok for a wet clutch...it's a long story!)
Beyond that, the synthetics are superior to plain old petroleum oils (be carefull...there are 3 different types of synthetics), and the Group V ester synthetics are superior to the other two types. (For the record, Rotella is Group III, Mobil 1 and Amsoil are Group IV, and Redline, Maixma, and Motul for example all have some Group V ester based oils.
Some oil reading:
http://www.thumperfaq.com/oil.htm
http://www.sportrider.com/tech/146_0308_oil/index.html
http://www.maximausa.com/techn...news/LubeNews2002.pdf
http://www.p1-performance.com/pdf/oildoc.pdf