Signal convertion will take place if VGA is involved, so there is no difference between DVI and HDMI to VGA, both will need to convert analog signal to digital signal and vice versa.
6K is a very healthly budget and can have many potential builds for your workload, it is not necessary to follow all the parts listed below, you can always customize it to match your own requirements.

Intel Core i7 6700 - RM 1336
Gigabyte H170-HD3 (D4) - RM 446
Kingston 16GB DDR4 2133MHz Value RAM - RM 396
Palit GTX1060 6GB GDDR5 Dual Fan - RM 1238
Kingston SSDNow UV400 240GB SSD - RM 296
WD Blue 1TB HDD - RM 215
Superflower Leadex Gold 550W - RM 409
Tecware Alpha - RM 199
Dell U2515H 2K IPS - RM 1389

Total: RM 5924 (ETech price inclusive of GST)

Superflower is the OEM for many PSU brands out there, so no worries on this, in fact the specific model that I've chosen is a top tier (grade A) PSU that is available at a very affordable price in the local market.

Not all EVGA PSU are made equally, some of the low end EVGA models are just so-so and EVGA doesn't manufacture/produce PSU at all, they outsource the manufacturing process to other PSU OEM like Superflower, FSP and Seasonic, what they do is just simply apply their brand name sticker (and other info) on the PSU itself and do the packaging before they ship it to the retailers 

GTX1070 which packs more CUDA cores (33% more) than GTX1060, this will certainly help in those GPU oriented operation/process, but first you will have to find out whether your workload involves all those heavy GPU bounded stuffs or not first, if no then GTX1060 should be enough.