i like the 600RR red. i would go with a factory bike or car color to make it easier to see what you like and have a painter duplicate it.
i also like gaurds red, common porsche color among other makes.
bmw made a mugello red i really lke, found on the older M3's, kinda got a tinge of orange and pink and looks pastel red to shiney red depending on lighting, not a darker red like the typical "sports car red". cinnabar red would be hot too, found on the old school m3's, has a bit of orange in it.
lemme see if i can find pics. they both look pretty similar to the 600RRred that i like, damnit, they dont show up, here is a link, this is cinabar red on a e30 m3, mugello red is from the next gen m3 and is similiar except in person. either way, they look like the 600rr red.