Grays SOOO EARLY!!!!

So, at the ripe old age of 30, I seem to have more gray hairs than brown, and they take over more every day!!!!  Getting ready today I have finally decided to give into my sister and color my hair, when I loose another 5 lbs....I'm doing a 5 lb challenge through WW.  You set a goal, non food related, for every 5 lbs you loose.  I have 1.5 more lbs to go before I get to my first 5 lb goal, I started this 2 weeks ago, which will be a haircut, much needed and I've decided to set my 2nd goal to be a color job, haven't colored my hair since I was 19.....now all I need to figure out is stay the same color as my currently brown hairs:-) or to go lighter????  I look forward to any thoughts on the subject, I stink at making decisions like this!!!