If I were in your situation and getting a portable, I'd get AppleCare over the Best Buy warranty.
I've used AppleCares mail-in service twice for notebooks. One I dropped off at FedEx Tue evening and had back in my hands first thing Thursday morning, which was less than 48 hours. Everything was priority overnight shipping, no cost to me. The second experience was about a week, but the part was on backorder everywhere, so no other method would have been quicker.
Virtually all Best Buys send broken Macs to a repair depot to get fixed, so even though they may have a local store near you where you can drop it off, there is still shipping going on behind the scenes.