If you can only imagine yourself in a top ten department, i would say give up. Not because of the GREs but because you are probably not interested in the PhD, and research enough. Also with any GRE points the application process is a crap shoot and you might encounter a massive disappointment no matter what. While here everyone wants to encourage you , we do not know your profile and we do not know who else is applying so noone will be able to tell you what sort of chances do you have (GREs aside). If you think you could be happy elsewhere (not top ten) then research some good backups and then you will not stress this much.
