You can get something similar to the ASUS ROG GR8 for much cheaper....
Small is beautiful, and you budget is aplenty:
CPU+MB: Intel Core i5-6500 + Gigabyte GA-H170N-WIFI @ $513 (PC Themes)
RAM:
Kingston ValueRAM DDR4-2133 CL15 8GB @ $57+3^
GPU:
Palit GTX 960 2GB JetStream @ $274+3*
SSD:
Transcend SSD370S 256GB @ $109+3"
HDD: Western Digital Blue 1TB @ $77 (PC Themes)
CASE+PSU: Silverstone Raven RVZ01 + Silverstone SX500-LG 500W [80 Plus Gold] @ $255 (t258jgn)
Total: $1294
Optional:
GPU: Zotac GTX 970 4GB Twin Fan @ $479
Pretty overkill but ideal for most games on Full HD at max settings.
Buy others from
Lazada Singapore. Haggle for discounts!
All Lazada prices inclusive of delivery charge
Lazada
Web prices after Shopback.sg 2% electronics rebate
*Price after Lazada
Web MasterCard Monday / DBS/POSB FriYAY / CITIBank Wild Weekend 8-10% off max $25 discount with MasterCard cards
^Price after Lazada
App AAPROMO $15 off min $60 promo code
"Price after Lazada
App DBSEOY20 $20 off min $100 promo code with DBS/POSB cards