Price is changing almost everyday now due to the poor performance of our currency, high chance that you will need a new price list (or build list) in December 

Intel Core i5 6500 - RM 906
MSI B150M Pro-VDH - RM 340
Corsair 8GB DDR4 2133MHz Value RAM - RM 238
<GPU reuse>
Kingston SSDNow UV400 240GB SSD - RM 315
Seagate Barracuda 1TB HDD - RM 205
Corsair VS450 - RM 162
Segotep Gank II - RM 179

Total: RM 2345 (ETech price inclusive of GST)

If you want to allocate part of your budget for the 144Hz monitor, you can remove the SSD and use the funds to get BenQ Zowie XL2411 (around RM 1150)/Acer XB240H (around RM 1000, not sure still got stock or not).

Stable 144 FPS is very hard to achieve with your current GPU (medium settings should be around 90+/-), dual monitors setup isn't a big issue since only 1 monitor will be used when gaming, meaning the GPU is still going to render the same amount of pixels of your current single monitor setup. Higher VRAM usage is unavoidable, the second screen will consume around 200 MB (more or less) from your total video memory pool.