What's the best over the counter hair color to cover the occasional gray hair?

I don't want to look like I color my hair, nor do I want to change its natural color? Could I use those 5 minutes rinses like Just for Men?What's the best over the counter hair color to cover the occasional gray hair?
I use Perfect 10. It's a little pricey(10 to 11dollars) but I only have to color my hair about every three months....What's the best over the counter hair color to cover the occasional gray hair?
My regular dye favorite is usually Garnier... but I bought my mom Clairol Nice 'N Easy Gray Solution http://www.clairol.com/niceneasy/graysol/a> for her grays, and it worked perfectly with her naturally dark brown hair without changing her overall hair color. Now that it's growing out, she's asking me when I'm buying the next box! :)



(See the link for the product) We haven't had any problems with it, and they have natural-looking colors that match your shade, or may even enhance it a bit... but most importantly, it's made for gray hair!
I've heard that superior preference colors work well. Also, nice n' easy makes a color line called gray solutions specifically for gray hair.My aunt uses the preference, and she likes it.
Well gray hair is sometimes difficult to get rid of. I suggest getting your hair colored a dark brown, it will probably do best for you. ! ^^
I've used a few hair colors to cover my gray hair and most fade out pretty fast, except for loreal creme excellence. it works pretty well.
NICE n' EASY Hair colour... it looks really natural and does not fade quickly