How do you even come up with a number right now? My concern would be that it's virtually impossible from both sides.
Does Bill Belichick feel comfortable attempting to come up with a number of say, 2 million dollars for a one year deal? After all, Lewis could fumble tomorrow and never see the field again (or at least awhile, anyway).
A multi-year deal would practically be out of the question, at least until free agency comes and Lewis and the Pats allow the market to set his value. Why would Lewis be quick to jump on a deal if he has another good game tomorrow, when he can simply wait until March for a team to open up their checkbook for something in the 3-4 million dollar per year range?
It seems to be something of a gamble for both sides right now, at least in my opinion. Perhaps they could agree to something later on in the season? Either way, he's been a pleasant surprise for the first 2 games, and we hope it continues.