Everytime I read these kind of posts, I get envy because I can't find any Becky Higgins stuff in Thailand. If I want to do a Physically Project Life, I will have to order from Singapore and the price will be 2-3 times, not include the shipping fees yet. I'd nearly ordered many times though, but always tell myself to stop, STOPPPP!!!
I know I will probably get myself a set of Becky Higgins PL one day which I only want the album and page protectors, but that will be after I buy myself a Selphy. How can I work on PL without photos, right?
Anyway I still feel envy everytime I see your pretty PL pages.
Back to the topic, If I were you, I will definitely go with the design F first. You can always add more pages afterwards with PL. That's what I'm doing with my digi-PL. I make the pages for the week which normally features the story of that week then I'll insert some little things like photos, quotes, thought, etc.
So if design A doesn't come out yet, go on and work with anything you have. Don't wait!