HELP WITH THE CORRECT PSU and pc build

GOOD DAY! 

 

here is my build and I am currently confused with the power supply cause I am planning to overclock and I don't have much idea on computer hardwares so here are the specs

 

CASE: COUGAR AF-2 
CPU: AMD FX 6300 3.5GHZ VISHERA 
CPU COOLER: COOLER MASTER HYPER 212 EVO DUAL FAN 
MOTHERBOARD: ASROCK 970 EXTREME 4 
RAM: GSKILL RIPJAWS 8GB(4X2) 1866 MHZ 
SSD: OCZ AGILITY 3 60GB SATA 3 
HDD: SEAGATE BARRACUDA 1TB 
PSU: HEC COUGAR 550W 80 plus certified
GPU:HIS 7850 ICE Q X or HIS 7870 ICE Q X

If I overclock and use 7870 or 7850 and 8 fans on the case can i still use 550w or use a higher 600w psu?

also I am thinking about the instant boot vs the ssd

 

Any Ideas ? NEED help badly parts here in the Philippines are bit expensive