You've had a couple of days to mull over our review, but now it's go time: the iPhone 5s is now available for order in Apple's online storefront. The new handset appeared on the store after the typical pre-release downtime, listed in 16, 32 and 64GB flavors for $199, $299 and $399, respectively. Impatient buyers can also find the iPhone 5s at their local brick and mortar store,
