onefreeman - you are right that they might want another ClickMiles purchase after the opening of the account. Therefore, just to account for that possibility, I will purchase one CD from Music Boulevard, or one book from Barnes and Noble.com, after my e-trade account is opened but before December 30, so as to make sure that I cover that possibility. I'll buy something I would have purchased anyway, so that it isn't creating a greater cost for the miles.
Pgup is correct that you can get miles fo investing elsewhere, but you can't get this many miles for investing only $1000 anywhere else right now, even if I only end up getting 7500 out of the deal.
Will report the results in the future.