How long will it support me!

[mdjobair.6500]

I'm about to build a PC with total budget of $850. But currently its $425. I'll upgrade it Consistently.

Current Specs Will Be
CPU:- i3-8100
mobo:- Gigabyte B360 Aorus Gaming 3 Wi-Fi
RAMs:- HyperX Fury (1x4GBs)
SSD:- Adata SU650 - 120GBs
HDD:- Toshiba DT01ACA100 1TB
GPU:- No
PSU:- Non branded

Future Upgrades Will Be
HyperX Fury (1x4GBs) to (4x4GBs), PCI SSD, GPU:- RX 560 - 4GBs, PSU:- Corsair VS450

How long will it be supportive? Also if there are any suggestions for components in the budget.
(Sorry for my bad English)

 

[ritvarsdavis]

I don't recommend a 120GB SSD. It's too small for any normal use. You'll regret it later.
Upgrading RAM can be tricky as it's not guaranteed to run in dual channel. That's why it's recommended to get a kit of 2 sticks.
VS450 is a crap PSU, I wouldn't touch it if I were you. A much better option would be Corsair CX450M (2017) or SeaSonic M12II-520 Evo. The Corsair one is a bit better for modern builds, but can be more expensive. Both are good quality PSU's though.

 

[WildCard999]

Dump the SSD, go with 8gb of RAM instead and get a better PSU as ritvarsdavis said.

 

[Greeko85]

In addition to everything said, going by Intel's track record I can't see them releasing a new CPU gen for that socket. With that said though you can always move onto an i5 8400 or better and that will last you for quite a while.
But as others have mentioned do NOT cheap out on a PSU and go for a dual channel ram kit-it will save you headaches down the line.