SGD2.5K can get you quite a good 17 inch gaming laptop already
For aftershock, you can get either XN17 or X17 with some freedom in configurations, for example:
XM17 (below SGD2K)
entral Processing Unit 3rd Generation Intel® Ivy Bridge Core™ i7-3630QM
Graphics Card NVIDIA GEFORCE 660M GTX 2GB DDR5 (Base)
Memory (RAM) 8GB DDR3 1600mhz(2x4)
Thermal Compound IC Diamond Thermal Compound CPU + GPU (Free Lifetime Thermal Compound Re-pasting) *Promotion*
Hard Drive 120GB Samsung 840 SSD (Free Promotion)
Second Hard Drive Western Digital Scorpio Black 500GB 7200 RPM
Optical Disk Drive 8 x DVD ± R/RW/4X +DL Super Multi Drive & Software
Display 17.3 Inch Full HD Matte LED display (1920 x1080)
Professional Color Calibration Default Monitor Calibration
WI-FI Bluetooth Intel Wireless N Advanced 6235 + Bluetooth combo card
Operating System Windows 7 Home Premium x64
Warranty Aftershock 2 year parts, 3 year service (pick up and delivery / On Site)
Bundles None
Carrying Case None
or X17:
SGD around 2.2K
Central Processing Unit 3rd Generation Intel® Ivy Bridge Core™ i5-3210M
Graphics Card NVIDIA GEFORCE GTX 675M 2GB DDR5 with Optimus Technology
Thermal Compound Stock Thermal Compound
Memory (RAM) 8GB DDR3 1600mhz(2x4)
Hard Drive Hitachi 500GB 5400 RPM HDD
Second Hard Drive None
Optical Disk Drive 8 x DVD ± R/RW/4X +DL Super Multi Drive & Software
Display 17.3 Inch Full HD Matte LED display (1920 x1080)
Professional Color Calibration Default Monitor Calibration
WI-FI Bluetooth Standard 802.11 B/G/N + Bluetooth combo card
MSATA None
Operating System No Operating System
Warranty Aftershock 1 year parts, 3 year service (Pick up and Delivery / On Site)
Bundles None
Carrying Case None: