For the RAM any major brand will do (e.g. Corsair, Crucial, Kingston, G.Skill).
For the SSD the cheapest reliable drive I usually find is the OCZ Trion 150 (if you can find a Samsung 750 Evo for a comparable price it'd be better).
For the HDD either a 1TB Seagate Barracuda or WD Blue would do.
For the PSU look for Corsair CX M (do NOT buy the non-M CX), Seasonic S12II and XFX TS.