I really liked the Loreal Color Vive line until a year ago when I opted to purchase Pantene Pro-V. They have oone called Color Revival that I have been pleased with.
Also the new product by Nice n Easy called Root Touch up, they have had coupons in the Sunday inserts, it normally sells for $6.99 at Rite Aid. They claim it works for three weeks to touch up on roots and I tried it once so far and felt it worked even longer than that time period. It was so easy to use, brush it on and keep it there for 10 or 15 minutes. A much simpler process than coloring the hair again.
Good luck!