However, given the task at hand:
I would use your fastpass strategy, but hit Soarin' first instead of Mission: Space. The split for the opening crowd is about 65% to Soarin' and 35% to Mission: Space/Test Track.
Once you have your Soarin' fastpass head over to the opposite side of Future World and and use the standby line for Test Track followed by Mission: Space (spinning version). Head back to Soarin' when your fastpass is ready (remember, even if your fastpass time has passed Disney rarely - if ever - turns away late fastpasses, only early ones!).
The Sunshine Seasons Food Fair is an excellent counter service option for lunch, and could provide some extra time (and energy) for things like Living With the Land and Turtle Talk With Crush - two can't miss attractions, imho.
Then you can finish the tour with Spaceship Earth as you exit the first half of the tour.
During the World Showcase part of the tour, I have to put a plug in for getting a Kaki Gori snack just on the outskirts of the Japan pavilion....these combination snow cone/slushies are outstanding and should not add much time to the touring plan...just a few inches to your waist! =)
My gut reaction was to do as you suggest, James, and send people to Soarin' for FPs first. But I questioned if that would leave people better off. Is it worth the longer wait at Soarin' to avoid having to walk across Future World an extra time?
Granted, I'm not in Orlando, so I'm going with second-hard reports here. So if I'm wrong, and the line for Soarin' gets nasty fast, even on moderately busy days (i.e. more than 30 minutes after the park's been open for one hour), then I'll switch the tour to the order James suggests.
Let's try this: Can any Orlando readers answer this? What is the typical stand-by wait time, during summer, for Soarin', Test Track and Mission: Space at 10 am?
For World Showcase....there are 2 notable rides(Not-To-Be-Missed). "Gran Fiesta Tour Starring.....The Three Caballeros"(its inside the Mexico Pavillion. If you don't know who the Three Caballeros are, you'll be satisfied to know that Donald Duck is 1 of the 3 members, so don't pass this ride up, because Donald plays a great role in this nice boat ride through mexican culture). And "Maelstrom" at the Norway Pavillion area(Its a nice boat ride with lots of norwegian theming including some tricky trolls). If you are a fan of theme park rides, more than shows, than you will want to note that "Gran Fiesta Tour" and "Maelstrom" are the only 2 "rides" througout all of World Showcase, however, even if you aren't a fan of shows, "Illuminations: Reflections Of Earth" is by far the best firework show you will see at any theme park you ever visit, so don't pass that show up at the end of your day at Epcot.
In your touring plan, you could probably grab Soarin' fastpasses, ride TT, MS, and Spaceship Earth (on the way back to Soarin') before your Soarin' FP is ready. However, I like your plan for hitting SE on the way out as it seems like a fitting conclusion to the tour.
Hitting Ice Station Cool (as mentioned above) would be kind of neat, because the coke products from around the world you sample are free (something for free at Disney!!), and fun. However, we are getting way beyond the two hour limit for the front half of Epcot that you have established...
...that's the problem with Epcot...if you are a first time visitor, you really need to take the time to explore and savor the experience.....there isn't another theme park like Epcot in most people's backyard....
Still...four hours is four hours....stick to the plan, but I say hit Soarin' first for fastpasses, the time saved is definitely worth the backtracking.
What say you, Orlando natives????
Disney's Hollywood Studios coming up later today....