I have been slowly getting a few Caran d'Ache Luminance colored pencils. I like them for the different colors they have. They cost twice as much as most of the other pencils (around $3 apiece). But each time I make an order with Dick Blick, I order a couple of the pricey pencils.
I have also been building up a supply of Caran d'Ache Pablos. I like colored pencils that are dryer and not as waxy. Derwent Studios, Pablos, and Prismacolor Verithins are all favorites of mine.
As most colored pencil artists know...you can never have enough pencils.