Obviously, it's not coming out of my pocket. I'd say there really isn't any price too high on a two year deal. I think years much more than dollars is what could be killer here.
I also say that assuming that no team will offer him more than 10 million a year. I'd say ideally under 20 million over 2 years, but I'd go north as long as it stayed at 2.
Ultimately, I don't see many teams offering him big money. If a team sucks and is years away, he's useless to them. If a team is a legit contender, they probably can't offer him more than the MLE. I could maybe see a team that misses out on the FA-palooza pay him big for one year, but I don't see many teams wanting to have him hindering their plans next summer.