Question I wanted to be sure before buy this system

Jul 11, 2019
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Gigabyte RTX2060 6 GB GDDR6
Corsair Carbide Spec Delta RGB 550W 80+
Ryzen 5 1600 12nm
Gigabyte B450 Aorus Elite soket AM4 DDR4
1X Team T-Force Vulcan 3200 MHz CL16 8 GB
Gigabyte 240 GB SSD disk

I have a plan to buy and upgrade this system little by little(in 6 months).
For example adding ryzen 3th gen cpu, 1 more 8gb ram to reach total 16 gb and 1 TB HDD . Is this a good plan?
 
There a few issues with that config.

1 single stick of ram is not going to allow for maximum performance from your CPU.
The Corsair VS PSU would not be a good idea with an RTX 2060.

Is this a complete system you are buying or a parts list?

It is a complete system and I'll upgrade ram with one more stick as soon as possible and I have only two options for psu which is corsair or frisby and I know that frisby is so bad. They also have 3 years of warranty for all parts that I write.
 
ASUS TUF B450-PRO GAMING 4400MHz(OC) DDR4 Soket AM4
AMD Ryzen 5 3500X
2*XPG 8GB Gammix D30 Kırmızı 3000MHz CL16 DDR4 Single Kit (total 16gb)
ASUS ROG STRIX Radeon RX580 T8G Gaming 8GB GDDR5
TOSHIBA OCZ 240GB TR200 SATA 3.0 2.5" SSD
Corsair Spec Delta RGB 550W 80+ Mid Tower ATX (same psu and case with others unfortunately)
same price
I m so confused right now.