Upgrading My PC. Help & Suggest ?

Hi I want to upgrade my old Pc.

My rig (2005 model)

CPU : Pentium 4 2400 MHz Socket 478
Ram : 1 GB DDR2 (Maybe 800 or 1066 mhz) Don't know !!!!
Mobo : Zebronics -915g
HDD : 80 Gb IDE Samsung
PSU : (Don't Know)
Monitor : 15" syncmaster 591s
Cabinet : (local)

will change to >>
CPU : amd a10 5800k or i3 3rd gen
Ram : 4 GB (i think its sufficient)
mobo & psu: ? (suggest)
hdd : 1 tb sata
Cabinet : iball
monitor : full hd 24" any

PLZ hELP ME !!!
tHANKS