Start as extreme as you can, because you will end up compromising and getting less than what you asked for. The only question is: where is there line beyond which you won't even begin to get a conversation started. Wherever you decide that line is, start your demands there, because you will have to give something up.
I try to like humans, but I hate this part of humanity more than nearly anything that isn't an atrocity. If people would enter negotiations in good faith, and not having to play shitty games like this, I would like my fellow man far better. Then again, I also hate poker and other forms of gambling, and am probably in the minority about this.