Lots of people of switching to copic markers and I totally understand the why - but PRISMACOLOR MARKERS are still my favorite.  I suggest to my art students (adult) when they begin the process of adding color to their drawings and designs.  The versatility of the double end (one a large wedge & the 2nd a fine tip) actually doubles the count to me (so 24 markers = 48 usable ends).  My favorite characteristic of these markers are the layering of hue upon hue and use for highlighting, shadows.  I often use these markers for both designing the finished product of book illustrations.  They are also available in gradations of grey and flesh . . . perfect for monochromatic and portraiture.