If you're going to Fastpass 7DMT later in the day, anyway, and aren't interested in reriding it, I would consider Fastpassing Peter Pan as well for later in the day. That way you could leave the EMH hordes in Fantasyland and accomplish pretty much all of Tomorrowland, which is sparsely crowded at rope drop. Space Mountain is usually a walk-on, or nearly, for the first half hour of operation. Since you want to reride Space Mountain, I would start there and re-ride it once or twice, then head to Buzz Lightyear which will still have a modest wait and also likely be reridable. Your order at 9 seems fine as long as you're ok with trudging all the way over to BTMRR and working back. It might be easier to do it in the reverse order, though, as HM, Pirates, Splash, and BTMRR. Your standby at Big Thunder would be your longest wait of the entire morning, but obviated by the fact that your next ride will be via Fastpass.