Elza, yesss, buy the book. I have that one and Vintage Knitted Socks. Between those two, I really don't feel like I need any other sock books. But, def, Sensational Knitted Socks is like the end-all, be-all of socks books.
Amber, the cotton is kind of fussy in that it was tight when I first did the sock, but now that they've been washed and worn for a while they've loosened up and fit really well. They still go on kind of tight at my heel, but I think that's part of the chevron pattern. I hear people say the same thing about Jaywalkers. They stay up fine, but I only made the leg part like 5 inches (from the start of the heel flap to the top of the sock.) I don't think they'd stay up too well if you made longer socks.
Jackie...holy smokes, that's gorgeous! thanks for the link. There's no way I'd have the patience to make that.