I also recommend the Spectrum Noir markers. You can find them at Joann's stores in sets of 6, usually all shades of one color. The price there is usually $14.99 for the pack, but if you wait and use coupons, like 50%, that brings it down to $7.50.
I also have multi-colored sets of Bic Mark Its and Sharpies. They color well, but the colors are very bright and intense. If you go that route, you will need to fill in with pale colors in other marker brands.
Bugga in OK
"Be kind whenever possible. It is always possible." Dalai Lama