Whats the best for my hair? ?

So my hair is naturally dark brown, but i still color it the "darkest" brown which looks black but it's just really dark and looks fab with my skin color because im a fan of the tanning salon (4-5 times a week) and recently I decided to grow out my hair long so my hair stylist said to stop coloring it because the chemicals prevent it from growing. While it is growing now, it looks kind of crappy to me because my natural is brown but the part growing out is darker...I think it looks bad but alot think i did it on purpose and it looks good... When i see other chicks with the blonde streaks or crazy color it makes me want to do somehing so i will stand out.So whats best for my hair???? should i resist temptation and let it grow out??? I mean my natural color is beautiful but it will take so much time to grow out which is my goal to have natural hair again..But sometimes i get that urge to make an appointment at the salon to do all over color again..What do you guys think i should do???