>I also want to get the offer that an hard pressed negotiation would give me

He doesn't sound like much of a friend when you say that. The easiest solution is to find employment elsewhere. When you bargain with a friend with that kind of mindset you will either press too hard and lose him (and potentially the offer too) or you'll end up feeling resentful at being "underpaid".

There is no magic bullet or answer to your question. Either roll the dice or preserve the friendship by looking elsewhere.