Dude. You're awesome. You practically did all the work for me (at least on the scoop neck - I've never actually *finished* a sweater, so I have no idea how they work), so there's no reason NOT to cast on now! And I suck so badly at math (like claiming there are 7 school days in a week, and 4 x 4 = 20), too. I like that there are numbers!
Thanks so much. I really appreciate all the pointers and help you've given.