Why would you want to give up that much? That's really mortaging the farm.
Well, it's a lot, but I probably would trade that much for a 24-year-old Doughty, which is what McAvoy is. The only difference is McAvoy is a bit more creative and a passer who is steady and consistent, while Drew has a better shot and is streaky. Like Drew he plays stellar defense. He's a #1D in every sense of the word.
If Clarke comes close to McAvoy I will be very happy.