I think it's a fair offer, and if Lee gets back on track it's a good deal for you. My only issue is that I don't believe Lee will be as good as he's supposed to be. But, that's just me. If you like it, go for it.
I had Latos as my best pitcher for a while. (Latos/Cain/Nolasco/Chacin/Lilly/Matusz/something I dropped quickly was my draft...) If you watch the WW, you can pick up some good ones though. viewtopic.php?t=432598
if you want to take a stab at it.