The easiest choice is a medium brown or reddish brown if your hair is light. Not being intense, it is the easiest color to avoid a dye job that looks fake and could be a disaster. If your hair is very dark, it is best to save up and use a salon. You just can't do it at home.
I have tried many differnt at home hair colors. Personally i think revlon is one of the best. The color is easy to apply and lasts a long time. Also, herbal essences hair color is good, and it smells good too.
Personally, I prefer to use herbal essences collection. Very hydrating, A lot of extra conditioner, and the gloves are latex, not plastic, it is very inexpensive.