Polychromos coloured pencils by Faber Castell are my favourite of the moment ...but tastes can change over time. I used to swear by Derwent but now I find find them a bit too hard. Their graphite pencils on the other hand are better than Faber Castell's in my humble opinion.
I hear Derwent have a range called Coloursofts but I haven't tried them out yet.