im going to agree whole heartedly with slorak here, its not a colour
set you should be looking for, but rather colours that are easy on the eye (goodbye hot pinks, fluros and bad moon yellow... *twitch*, i really hate that colour), are easy to paint, and depending on how much time you intend to spend on a single figure - how many layers and shades you intend to use.
so, my advice is:
Pick a colour, then either pick a contrasting colour, or a darker or lighter shade of your colour.
eg:
bleached bone/snakebite leather
scab red/zombie flesh (yay, i use this one

)
white/grey
white/scab red (my marines)
catachan green/dark angels green
then decide how your going to detail them, wether its silver, gold, black, purple, or wtv. something that will show off the rest of your paint scheme. generally you would want to pick a colour that will stand out and draw attention to the detail, so using a colour thats going to fade into the rest of the area isnt a very good choice (i.e. silver edging on white armour, doesnt always work)
another choice you should then make is wether you want your armour plates to be glossy or matte. for example, the catachan/dark angles scheme blends together quite easily, so would need a definite edge, or the armour plates would need gloss to make it stand out that little bit more.
hope that helps
~Silver
oh, and by the way, welcome to LO