What color?

I'm thinking about going back to a darker color again, but I'm not sure what to do exactly. I used to color my hair Auburn, but wanted a change, so I've been blonde for a while now. I last used L'Oreal Colour Experte on it (can't remember the color, but it was the lightest blonde one) and it looks good, although not quite as light as the model on the box. The highlights and everything turned out fine. But I'm noticing my ends are starting to get a bit lighter than the rest of my hair now, from doing the blonde thing for nearly two years. That, and I'm kind of wanting to give my fine hair a rest with the lightening I've been doing. I don't want to go too dark, and I don't want to be red again. What color would you recommend so I don't end up green or red? My natural color is a light/medium brown with some goldish tones, so I tend to really pick up red/gold tones.