Scan today only is a good call especially on the weekend when you can pick up pretty much everything you need.
I’d definitely recommend a K series Ivybridge I5 and a Z77 mobo, either Gigabyte or Asrock which I prefer, 8gb of ram is plenty, SSD system drive + a storage drive, a bare minimum 550w quality psu, cooling and case depend on budget. I’ve got pretty much that system but with a sandybridge cpu clocked to 4.7ghz and it munches through everything, renders in seconds and rarely goes over 30% cpu in live with 50+ vst instances running.
I make music as a hobby and build computers for a liviing so could put something together, give you some advice if needed.