Seeing your pics, I would suggest going with #15 Golden Beige Blonde (neutral) or #16 Light Ash Blonde (ash), or a mix of both.

If your hair is currently as dark as your avatar, then you might need to do the color correction with ColorFix first to lighten it up a bit (just parts 1 & 2). But beware that it will probably pull red (unless you do it twice and go real light). If you do use ColorFix, I would definitely use the Ash Blonde to tone it. But if your color is faded to lighter, then you might be ok with just coloring. RC won't lift the old color (no color does) so if you are darker than normal now, it won't lighten. Are your roots darker or lighter than the length? That would be the deciding factor.

SF Bay Area, CA * "The Angel-Goddess-Guru of Haircoloring"
3b/c/a mix. medium texture, low porosity
My Motto: Strand Test! some hair pics
-- gone, but never forgotten.