My hair is natuurally a "medium ash brown" color. I use the light mountain naturals brand and have only tried the chestnut brown and black colors. I have found that the chestnut brown color does have "coppery" tones to it. The black color does not, but looks just a dark grey color, which blends in okay, but I'm not really fond of it and prefer the coppery color for myself.
I have not seen any blonde colors in the light mountain naturals brands, but I did see a new brand (called Rainbow Research) that has blonde colors, but I cannot attest to what kinds of undertones will show up in your hair if you use it. Here is a link:
You may be able to find a better price in a local store or elsewhere on the internet. If you like it, you can purchase a bulk amount to save money.
Good luck. I know that my hair has improved sooooo much from switching to henna. Not only do I save a lot of money on coloring (I only spend $30 per year, vs $10-15 per month), but my hair is no longer dry or split (which saves me even more money on other hair-care products). I don't even have to use conditioner on my hair anymore!