I'm also from Turkey, I'm building my first rig right now. I thought about going for rx vega 64(it has the same price with rx vega 56 for some reason in turkey). But in the end I'm buying 4x 1070TI instead of 3x vega64s. The reason is; it is just better for future. It has better resell value, it can mine different algos better, it is basically plug and mine with some OC and power limiting on afterburner.
Monero mining with rx vega is insanely profitable atm but you never know whats going to happen so I like to have more options just in case. Also as a gamer I prefer nvidia over amd and I might use one or two of those cards on my gaming rig if everything else fails.
hey man, thanks! I put my ideas into a spreadsheet and did some calculations. getting 4 GTX 1070 Ti s gives me the same performance as 6 GTX 1060s with less power and for the same price. Looks like I am also going to get 4 of them. Which one did you go for? and also from which Turkish retailer?