Can you do better than this for 700€?

This is the build I've been making:
Intel Core i5 3330 3.0GHz (3.2GHz Turbo) 6MB BOX - 169.5€
ASUS P8B75-M LX INTEL B75 SK1155 - 58.9€
G.SKILL ARES DDR3 2X4GB 1600MHZ CAS9 1.5V - 39.5€
WESTERN DIGITAL CAVIAR BLUE 500GB 16MB SATAIII (6GB/S) - 59.9€
Msi Radeon HD7870 Twin Frozr III OC 2GB DDR5 PCI-E - 231.9€
SAMSUNG DVD/RW 22X DLAYER BLACK BULK SATA - 17.5€
CORSAIR CX-500W 12CM BUILDER SERIES V2 80PLUS - 56.5€
Cooler Master K350 - USB 3.0 - 35.5€
Total: 669.2€

Is it possible to have a better gaming perfomance with this budget? (700€ max)
What do you think I should change? Better mobo? Case? PSU?
Only from here http://www.chiptec.net/

Menu links:
CPUs: http://www.chiptec.net/index.php?catid=15&pagina=0
Mobos: http://www.chiptec.net/index.php?catid=13&pagina=0
RAM: http://www.chiptec.net/index.php?catid=26&pagina=0
GPUs: http://www.chiptec.net/index.php?catid=4&pagina=0
HDD: http://www.chiptec.net/index.php?catid=2&pagina=0
Case: http://www.chiptec.net/index.php?catid=8&pagina=0
PSUs: http://www.chiptec.net/index.php?catid=8&subcat=85&pagi...
DVD burner: http://www.chiptec.net/index.php?catid=7&pagina=0