Valerie,
Your plans are great. It is a bit odd to see you keep the Magic Kingdom off so late in the week, but it still seems like a good plan.
As for Extra Magic Hours, I think you should definitely try them out. With moderate sized crowds typically in October, you should find them to be a good way to get more time in the parks, and the crowd size should not be a problem. I particularly like the evening hours, especially if you don't have any tykes with you.
If it were me, this is how I would do my week, but what you have as a plan is fine as well;
- October 1 - Hollywood Studios
- October 2 - Magic Kingdom
- October 3 - Animal Kingdom
- October 4 - Magic Kingdom
- October 5 - Hollywood Studios
- October 6 - Epcot
- October 7 - Free day
One final note. Love the saving of the 7th to being a free park day. Let your experiences throughout the week guide you to where you spend that last day.
Have a magical vacation!