Monitor required?

Intel Core i5 6400 - RM 785
Gigabyte H170N-WiFi - RM 569
Kingston 8GB DDR4 2133MHz Value RAM - RM 165
Zotac GTX970 4GB GDDR5 Reference - RM 1450
Kingston HyperX Fury 120GB SSD - RM 229
WD Blue 1TB HDD - RM 225
FSP Hexa+ 550W - RM 189
Phanteks Enthoo Evolv ITX - RM 369

Total: RM 3981 (Techview price inclusive of GST)

Alternative build with R9 390 8GB but no SSD.

Intel Core i5 6400 - RM 785
Gigabyte H170N-WiFi - RM 569
Kingston 8GB DDR4 2133MHz Value RAM - RM 165
MSI R9 390 8GB GDDR5 Gaming - RM 1550
WD Blue 1TB HDD - RM 225
Seasonic M12II EVO 620W - RM 409
Phanteks Enthoo Evolv ITX - RM 369

Total: RM 4072 (Techview price inclusive of GST)

Not recommended to do so as R9 390 is high in power consumption and Hexa series is a low-to-mid end grade PSU only, even though it will work on your system but not worth to risk it, if anything goes wrong, prepare to 

It is actually not an upgrade, they are performing neck to neck and are considered as same tier GPU.

GTX970 has much lower power consumption and this allows you to run it on a cheaper PSU, the drawback is its VRAM which is 4GB vs R9 390's 8GB, but for 1080p, 4GB is more than enough nowadays, only some games are using > 4GB VRAM if you turn all the graphics settings to max especially texture and environment quality, it also outperforms R9 390 in GameWorks enabled games.

While R9 390 is considered more "future proof" due to the extra 4GB VRAM but consumes more power and you need to spend more money to get a decent PSU to run it, if you compare the raw performance between them, R9 390 will have slight edge.