I would recommend dying it a SEMI-PERMANENT light ash brown color, considering you claim to have a lot of orange in your hair. Taking into consideration the health of your hair can be a big factor in choosing a hair color to dye with... for example, if you have very porous hair (like me) opt for a dye about one shade lighter than the color you want to end up with, because porous hair grabs onto dye and makes it look darker.
Another thing you could do is look for this new brand of SEMI-PERMANENT(can't stress this enough to only use SEMI's)called Clairl natural instincts brass free brunettes collection. It claims to minimize red/orange tones in your hair and leave it a nice, natural brown color. It comes in dark brown, medium brown, light brown, and lightest brown, and possibly more, but those are the colors I'm aware of.
Again, please take care to never use permanent dye, I've made this mistake far too many.
This is all simply my advice, I don't gauruntee anything will work for you, but am offering suggestions on how to better your situation.
Best of luck