Besides the GPU, little if anything else varies between each model. They're all available with a 17.3-inch 1080p display, five Core i5 and i7 processors (i5-520M through the i7-820QM), 4GB or 8GB of DDR3 1333MHz RAM, up to two mechanical (750GB max) or solid-state storage (512GB max) drives, a DVD burner or Blu-ray reader, a 2.0-megapixel webcam, and Windows 7 Home Premium, Professional, or Ultimate 64-bit.
There is one thing that differs between the machines, which is that only the GTX 480M version comes with USB 3.0 ports. Other connectivity includes HDMI and DVI-out, IEEE-1394 Firewire, eSATA, S/PDIF-out, a 7-in-1 card reader, an ExpressCard 34/54 slot, a 56k modem, gigabit Ethernet, 802.11b/g/n, Bluetooth, as well as audio jacks. All three variants of the eX-L 17 are available right now with an estimated ship date of July 7.