600w

AMD 2 PHENOM X4 965 BLACK EDITION (3.4ghz) 4gb ram 1 tb hard disk gigabyte ga-78lmt-s2p 1 dvd writer i bought a MSI NVIDIA GEFORCE GTX 560 (non Ti) ONE SHOP SAYS I HAVE TO BUY A 600W PSU ANOTHER SAYS 600 WON'T BE ENOUGH AND 800W IS REQUIRED as according to him the system (minus gpu card) alone...

I wana run to subs off it

it says it is in perfect condition. would this sound good and be worth it? seems good to me

http://www.bestbuy.com/site/Coby+-+600W+5.1-Ch.+Home+Theater+System+with+DVD+Player/9267385.p?id=1218077682250&skuId=9267385 What I'm wondering is- Is this just a basic speaker system that I can plug into my TV, outlets, or whatever and use it? Or do I need some $1000 expensive receiver?