Hey guys, first time on this forum so I hope on the right board.

That said, I'm aiming to put together a RESPECTABLE gaming PC for about $1500 AUD

These are the components I was planning on getting and I was hoping to GET some opinions:
Firstly, the quality of the parts,
Is everything compatible,
Has anyone heard about or encountered problems with what I have on the list, and
Any suggestions on alternatives to any of the components listed.

Also, with respect to the PSU, I had wanted to get a Coolermaster Extreme Power+ 650 but I found some NEGATIVE reviews. I was hoping to buy it as it's about 30% cheaper than the Seasonic.

Asus M4A78-EM Mother Board
4G Kit-800(2x2G) Kingston
4G Kit-800(2x2G) Kingston
Seagate SATA 1TB Hard Drive
896M GTX 275 GIGABYTE Nvidia
AMD 940pin X2 Phenom II 550 Processor
SATA Pioneer 218 DVD drive write and burn
THERMALTAKE V9 [No Power Supply]
Seasonic M12 80+ 600W
Coolermaster 120mm
Coolermaster 120mm

MS 64 bit VISTA VHB
18.5” Acer X193HQ HDCP WS

ANy help would be greatly appreciated.