I think that this is a game that you don't want to run any risks of not being able to play it. If you have the option, and the means... I would say find a way to get a pre-order. Showing up at Walmart at midnight would also be a good choice, but Camping out at Walmart would be a better choice in my opinion.
Do you have friends who would be willing to make an hour-something road trip to pick up a copy of (from what I've heard) the best game this year, if not ever?
I know that it's a tough decision, and it doesn't seem like an hour-something drive would be worth it... But I can pretty much guarantee you wouldn't regret it.
And if you couldn't get it at midnight, and had to wait until you could buy it somwhere... How much would you be kicking yourself?