One more suggestion, if you do decide to play it safe and spend the night.

At the time of day you will be arriving the Maglev will be operating at 430 km/h (its full speed) and well worth a trip from the airport. At the Maglev station, it is far easier to take the metro as the cabs at the maglev station are the congregating point for seemingly every dishonest cab in the city. (you can walk a short ways to a legitimate cab if you are interested). Staying near the Super Brand Mall in Pudong is enjoyable and relaxing with good nightime strolling options along the Pu River - or perhaps a splurge at the Grand Hyatt Pudong for about $200/night is worthwhile (a ~20 minute walk from the Mall and the river).