Cubehub SG and other usa/europe/aus reseller also sell it.

You can get Clevo x7200 (a.k.a NP7280) in any reseller. (refer to product catalogue at 1st post)
based on review, the battery can last more than 2 hours. The speaker config is 2.1 (except NP7280 which have 5.1), THX certified.
NP5160/NP5170/8130/NP8150/NP8170 can add extra hard drive in optical drive slot.
NP7280 have two hard drive slot and can add extra in optical slot.
Spec comparison (not include shipping)
Alienware M17x - $1,724.00PROCESSOR - Intel® Core™ i7 2630QM 2.0GHz (2.8GHz Turbo Mode, 6MB Cache)
OPERATING SYSTEM - Genuine Windows® 7 Home Premium, 64bit
MEMORY - 4GB Dual Channel DDR3 at 1333MHz (2DIMMS)
VIDEO CARD - 1.5GB GDDR5 Nvidia GeForce GTX 460M
HARD DRIVE - 320GB 7,200RPM HDD
LCD PANEL - 17.3-inch WideFHD 1920 x 1080 60Hz WLED
WIRELESS CARD - Wireless 802.11 g/n
INTERNAL OPTICAL DRIVE - Slot-Load Dual Layer DVD Burner (DVD+-RW, CD-RW)
SYSTEM COLOR Alienware M17x, Soft Touch Stealth Black
WARRANTY AND SERVICE - 1 Year Basic Plan
SOUND OPTIONS - Internal High-Definition 5.1 Surround Sound Audio
POWER ADAPTERS - Alienware M17x 240W A/C Adapter + battery
Sager NP8170 - $1,513.08 (config in cubehub)
Display: 17.3" Full HD LED-Backlit Display with Super Glossy Surface (1920 x 1080)
Video & Graphics Card: Nvidia GeForce GTX 460M GPU with 1.5GB GDDR5 Video Memory
CPU Processor: 2nd Generation Intel® Core? i7-2630QM Processor ( 6MB L3 Cache 2.00GHz)
Thermal Compound: Stock Standard Thermal Compound
Operating System: Genuine MS Windows® 7 Home Premium 32/64-Bit Edition ( 64-Bit Preloaded ) (add 90)
Memory: 4GB Dual Channel DDR3 SDRAM at 1333MHz - 2 X 2GB
RAID Storage Options : Non-RAID Storage
Primary Hard Disk Drive: 320GB 7200rpm SATA 300 Hard Drive
2nd Hard Disk Drive: None
Optical Drive : 8X DVD±R/RW/4X DL Super-Multi Drive
Caddy Case Options: None
Wireless Network Card: Internal 802.11 B G N Wireless LAN Bluetooth Combo Module
Primary Battery: Smart Li-ION Battery Pack
TV-Tuner: None
Microsoft Office:New! Microsoft Office Starter 2010 - Included in Price
Warranty:CubeHub 1 Year ASEAN Limited Warranty (Both Way Shipment covered) US warranty covered (add 100)