You are the first person to make it this simple. I have searched Many threads on the topic and have had little to confusion info.
I wish I would have heard from you sooner. I made OS partition 70GB. I am not much of a gamer so at most I would have one maybe two games installed.
I think I can increase the size of the OS partition in WIn 7 fairly easily, but I will have to look into that.
I will be installing some sort of MS Office, but no other real space hogs.
Music, movies, videos, pictures will all live on the remaining 400+