Not sure exactly whats wrong with the memory in the first rig.
The power supply in the first rig isn't the best, i agree, but it definitely isn't the worst.
Either setup will be perfectly fine.
which graphics card would be better out of:
-Sapphire Radeon R9 280X 3GB Dual-X Video Card
-Gigabyte Radeon R9 280X 3GB WINDFORCE Video Card
and wich would be the best memory out of:
-G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory
-Kingston Fury Red Series 8GB (2 x 4GB) DDR3-1866 Memory