colors for custom trail breaker

ok, so im making a custom repaint of trailbreaker from movie ratchet.
so far iv swapped the head and hands from alternators swindle. and iv almost done paint him all black.
but im not too sure what other colors to use. in G1 he was black silver and red. but iv been lookin at this custom:
http://www.tfw2005.com/transformers-ima ... 2.jpg.html
i want to know whether i should use red or blue as the secondary color. or anything else that i could add details to.
i will be putting up a pic soon once im finally finished with the all black.
thanks :]
so far iv swapped the head and hands from alternators swindle. and iv almost done paint him all black.
but im not too sure what other colors to use. in G1 he was black silver and red. but iv been lookin at this custom:
http://www.tfw2005.com/transformers-ima ... 2.jpg.html
i want to know whether i should use red or blue as the secondary color. or anything else that i could add details to.
i will be putting up a pic soon once im finally finished with the all black.
thanks :]