With all I read here, I noticed that the more important is to increase my budget to get a better GPU.
Regarding the i5 x Ryzen, I choose the i5, as here in Brazil the price are equal for both and I prefer Intel for DCS and also X-Plane 11.
I increase my SSD to 240GB and exclude the HDD for now.
This is the specs that I will get now:
Intel Core I5-7600K
Cooler Thermaltake Riing Silent 12 120mm
Asus PRIME Z270M-PLUS/BR LGA 1151
Corsair Vengeance 16GB (2x8) 3000MHz DDR4, CMU16GX4M2C3000C15
Corsair VS600 80Plus White PFC 600W, CP-9020119-LA
SSD Plus SanDisk 240G, SDSSDA-240G-G26
Thermaltake Versa N25 Black
EVGA Geforce GTX 1080 8GB GDDR5X 256Bit, 08G-P4-5180-KR
Thanks for all of your comments and suggestions.
Otavio