What color streak should I get put in my hair?

I have medium brown hair. The ends are more of a golden brown (lightened from being in the sun a lot). Occasionally when I'm in the sun, my hair has a reddish tint to it, so I guess you could say it has red/gold undertones? And if it matters, I have brown eyes that look hazel in certain lights, and I'm kinda pale.

Anywho, I feeling kinda rebellious and want to make a change (don't worry, I'm 19, so I don't need my parent's permission). I do have the colored hair extensions from Hot Topic (http://www.hottopic.com/hottopic/Accessories/HairA... ) but I think it'd be fun to have an actual real color streak in my hair.

Now I'm just trying to figure out what color. I do want it to be noticable, but not overly so. I don't exactly have the personality of the person that one would typically expect to have colored streaks in their hair (yes, I know, I'm stereotyping horribly right there. Sorry about that. I tend to be more quiet and studious, and don't go out of my way to get noticed often).

I want a single streak on the underside of my hair. Color suggestions?

*Thanks!*