Nice n Easy.
I've been using it for about 5 years. I'm naturally dark blonde, but when I was younger I used to dye my hair pink, blue, green ... Nice N Easy was always the best dye to get it back to blonde, never turned any funny colours. It's got a really good range of colours, I suggest getting a colour from their "Summer Blonde" collection.
Ooh! Ooh! Do what I did and use a home highlighting kit all over your head. Leave on for 5 minutes, then panic that your hair is looking too light, wash off, then stand back and admire the Hulk Hogan style barnet that you've created.
I totally agree with Suzieb. I always used to use Nice N Easy when I had blonde hair. Now I have changed it and become a brunette....I still swear by Nice N Easy. I wont even consider using anything else :)
personally i think you never get a good effect from home dyes. i'd just go to the hairdressers and be done with it, then you'll get the colour you want and it won't fade