I have a 4:30 plan and I'm not worried. Although I just did discover that there are something like 15 apple stores within a 30-40 mile radius of me. Not to mention all the Best Buys.
Plan is show up at Best Buy around 4:30, check line, send husband to Target that is 100 feet from Best Buy. If it looks like chances aren't good, head to one of the closer Apple stores.