Low-Mid Gaming PC Compatibility Check.

thezobot1

Honorable
May 6, 2012
8
0
10,510
Hey guys, thanks for taking the time to read this.
I am building my first PC and am a bit nervous. I just wanted to make sure that the components that I have listed below are compatible with each other.

Please take a minute and read through them:
Bitfenix Merc Alpha
ASRock Z77 Pro 3 Motherboard
Intel i3 3220
Sapphire AMD/ATI HD 7770 OC Edition 1 GB GDDR5 Graphics Card
Transcend DDR3-1333 DDR3 4 GB PC RAM (JM1333KLN-4G) (no link sorry :( )
Cooler Master Thunder 500W 500 Watts PSU
WD Caviar Blue 500 GB Desktop Internal Hard Drive (WD5000AAKX)

Is anything incompatible? Suggestions for better parts? Is the PSU powerful enough? Am I missing any major component?
Thanks so much for your time and your feedback is greatly appreciated.