If someone gives carlos lee 100 million, lord help us all. Everyone has a price range where you say no mas, and lee's is a lot lower than that. If he signs on the astros terms great, If he won't sign on your terms: I'd see what Luis Gonzalez, Cliff Floyd, Trot Nixon and David Dellucci want and if they are reasonable sign one to play corner OF. I'd also expect the Astros to sign huff at 7-8 mil for 3 or 4 years where he can play 3b/1b/OF depending on when garner wants lamb in the lineup as well.
I expect Williams to sign at 5-7 mil a year, for no more than two years fairly shortly. Other starting pitchers worth talking to if the price is right: Meche, Lilly, Schmidt, Suppan, Mulder, Eaton and Zito. However strike any boras clients off the list more than likely. As far as trade options: Jennings or Garcia(and Peavy if the pads are really serious about dealing him) would both really help the Astros at the right price.
Right now you have to build your pitching staff as if both Andy and Roger aren't playing, so that means they need another solid #2/3 type starter along with Williams in case bad news strikes.