Upgrade paths

[Scitesh]

I recently bought a Used PC 

and some extra parts

Here are the specs:

 

PC

i7 3770k

H61 intel mobo(m atx)

4Gb ram

Xpro 500W PSU(really sucks)

Circle case (similar to lenovo think centers)

Intel stock cooler

160GB HHD (YES)

 

Extra parts

2tb Barracuda

2tb WD BLACK (scavenged from an old build) 

Zotac GTX 1070 AMP

VS 650 (scavenged from the same old build)

 Wifi Card 

Antec X1 T(got from a friend)

 

What should my upgrade path be

 

Here are some ideas

Motherboard (z77)

PSU

case

SSD

Web Camera (launching a Yt channel)

[EPPHO]

Get 8 more gigs of RAM if you can or at least 4 more