Graying Natural Hair

I received the following question in my Ask Questions/Give Blog Topics form: 
I have been natural going on 3 years this August.  Although the transition was quite a process but one that was so worth it as I am so excited for the transition.  
My new dilema is I am greying mostly in the front of my hair around the edges and find it very annoying that in less than 2 weeks my greys are showing again.  I try to hold out as long as I can before coloring (permanent color) again by using touch up mascara and lipstick application touch up.  Can you recommend a brand or other alternative? Is Henna better than store brands.
I am getting to a point where I just want to cut off my hair and start fresh by embracing my greys but feel I am too young to be sporting greys now. I am torn as I have always had long hair and have no idea what I will look like with very short close to bald hair should I to a BC :(
HELP!!!  ---
Firstly, thanks so much for taking the time to ask me a question :-). Ok, here's the deal: 
The only store brand color I have used is Shea Moisture, which I used very recently and loved the results: 

It worked well, and didn't dry my hair out. I can't attest to the staying power yet because it's only been about a week. I would say Henna is better than store brands in that it is all natural. However, the only color you can get from true henna is red. Do not use any Henna that claims to offer a different color, because that means unnatural ingredients have been added to it, and it may not be safe. 
This is probably not the answer you want to hear, but I think you should embrace your grays! You don't have to necessarily big chop, you could just grow out your already existing color. You can transition out the same way you did with going natural. Don't feel pressured to big chop!