If doing piece by piece I would do something like...
1.Hard drive, Case, DVD Drive (if want that), case fans if one isn't in front and back - these prices don't really fluctuate
2. Power Supply - $100ish item depending on how good it is ofc
3. CPU/Mobo/RAM - expensive single purchase. Would do cpu/Mobo at the same time and wait on ram if u have to
4. GPU - lots of money on single part
5. SSD - SSDs are high in price atm
https://pcpartpicker.com/list/87CmvVOver budget but I wouldn't build a computer with anything less
Most definitely wait for ryzen 5
Like i said, i'm fine with going a little over if its worth it.
I dont know much about actually building pcs and what i need so all/any info helps