I've made a comparison Sager NP8690 with M15x
Screen and Screen Type: FHD
Graphics Card: GTX 280m (Sager) & GTX260 (AW)
SYSTEM CPU: I7-720QM Mobile Processor (1.6GHz)
SYSTEM MEMORY|*2 DIMMs: 4GB Dual-channel 1333MHz DDR3
HARD DISK DRIVE UPGRADE: 500GB 7200RPM SATA Hard Drive
Wireless: Intel® WiFi Link 5300
OS: Genuine Windows® 7 Home Premium
AW M15x = RM 6703
Sager NP8690 = RM 7434

That's RM700 for a gc difference.
Added on October 31, 2009, 11:31 pm I've also made a comparison Sager NP9850 with M17x
Screen and Screen Type: 18" (Sager) & 17" (AW)
Graphics Card: GTX 280m SLI
SYSTEM CPU: Intel® Core 2 Duo Processor P8700 (2.53GHz/ 1066 FSB/ 3MB Cache)
SYSTEM MEMORY|*2 DIMMs: 4GB Dual-channel 1333MHz DDR3
HARD DISK DRIVE UPGRADE: 500GB 7200RPM SATA Hard Drive
Wireless: Intel® WiFi Link 5300
OS: Genuine Windows® 7 Home Premium
AW M17x = RM 9875
Sager NP8690 = RM 9168
That's RM700 for a screen size difference.
Suddenly Sager that well known as cheaper than AW looks more expensive when comparison is made?
and if you stress that the different in price is due to best cooling, i don't believe it. better get AW afterall. those M15x and M17x have sufficient cooling system already.
for screen size, 17" is already big. 18" is way too big. difficult to find a beg that suit 18". plus the bigger the size, the more power form GC that you will required.